初一数学下册计算题100道

Question

计算题25道，因式分解25道，解方程25道，化简求值25道。
一定要是精挑细选的哦！！！！！！！！

Answer 1

(4+8)x125
=4x125+8x125
=500+1000
=1500

58x101-58
=58x(101-1)
=58x100
=5800

5600÷(56x25)
=5600÷56÷25
=100÷25
=4

269x5+269x99-4x269
=269x(5+99-4)
=269x100
=26900

147x19+81x147
=147x(19+81)
=147x100
=14700

(25+125)x80
=25x80+125x80
=2000+10000
=12000

120÷(3分之1-4分之1)
=120÷(12分之4-12分之3)
=120÷12分之1
=120×12
=1440

10.1×89-8.9
=101x8.9-8.9x1
=8.9x(101-1)
=8.9x100
=890

9.07-22.78÷3.4
=9.07-6.7
=9.07-（7-0.3）
=9.07-7+0.3
=2.07+0.3
=2.37

5+7×(8+12)÷(4-2)
=5+7×20÷2
=5+70
=75

16x4+16x6x16
=16x4+96x16
=16x(4+96)
=16x100
=1600

7/25×4/9+7/25×5/9

=7/25×(4/9+5/9)
=7/25×1
=7/25

60×(1/12+1/15+1/4)
=60×1/12+60×1/15+60×1/4
=5+4+15
=24

(5/12-3/8)×72
=5/12×72-3/8×72
=30-27
=3

6/7-5/24÷7/12
=6/7-5/24×12/7
=12/14-5/14
=7/14
=1/2

[3/4×(7/16-1/4)]÷9/13
=3/4×（7/16-4/16）×13/9
=1/4×3/16×13/3
=13/64

2/3-7/8+1/3
=(2/3+1/3)-7/8
=1-7/8
=1/8

5/6-(3/7-1/6)
=(5/6+1/6)-3/7
=1-3/7
=4/7

1-1/3-2/3
=1-(1/3+2/3)
=1-1
=0

1+3/5-1/10
=1+6/10-1/10
=1+1/2
=1又1/2

3/8-12/13+5/8
=3/8+5/8-12/13
=1-12/13
=1/13

1-(1/2-3/4)
=1+3/4-2/4
=1+1/4
=5/4

1-1/2-1/4
=1/2-1/4
=2/4-1/4
=1/4

2/7-8/9+5/7
=(2/7+5/7)-8/9
=1-8/9
=1/9

2-1/4-3/4
=2-(1/4+3/4)
=2-1
=1

1/2-(3/8-1/2)
=1/2+1/2-3/4
=1-3/8
=5/8

2.64×1.7-2.64×0.7
=2.64×(1.7-0.7)
=2.64×1
=2.64

31.5×1.07-3.15×0.7
=3.15×10.7-3.15×0.7
=3.15×(10.7-0.7)
=3.15×10
=31.5

2.7×5.7-2.7+5.3×2.7
=2.7×(5.7-1+5.3)
=2.7×10
=27

0.625÷0.125×0.8
=(0.625×0.8)×8÷(0.125×8)
=0.5×8÷1
=4

18.6×6.1+3.9×18.6
=18.6×(6.1+3.9)
=18.6×10
=186

52.5x2.9+5.45
=5.25x29+5.25+0.2
=5.25×(29+1)+0.2
=5.25×30+0.2
=157.5+0.3
=157.7

0.92x15+0.08x15
=(0.92+0.08)×15
=1×15
=15

0.72×1.25×2.5
=0.9×(0.8×1.25)×2.5
=0.9×1×2.5
=2.25

400.6x7-2003x0.4
=200.3x14-200.3x4
=200.3×（14-4）
=200.3×10
=2003

300÷125÷8
=300÷(125×8)
=300÷1000
=0.3

396-96-172-28
=(396-96)-(172+28)
=300-200
=100

125x24
=125x8x3
=1000x3
=3000

26x15
=(20+6)x15
=20x15+6x15
=300+90
=390

25x99x4
=25x4x99
=100x99
=9900

250x32
=250x4x8
=1000x8
=8000

(98+98+98+98)x25
=4x98x25
=4x25x98
=100x98
=9800

3/4÷5/8×3/10
=3/4×8/5×3/10
=9/5×1/5
=9/25

1.25×(8+10)
=1.25×8+1.25×10
=10+12.5
=22.5

1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78

1/2-(4/5-1/2)
=1/2+1/2-4/5
=1-4/5
=1/5

4800÷25÷4
=4800÷(25x4)
=4800÷100
=4800÷100
=48

2/5-(3/8-3/5)
=2/5+3/5-3/8
=1-3/8
=5/8

3/4-(3/7-1/4)
=3/4+1/4-3/7
=1-3/7
=4/7

3.2x0.125x2.5
=0.125x8x(0.4x2.5)
=1x1
=1

0.4×125×25×0.8
=(0.4×25)×(125×0.8)
=10×100
=1000

1.25×(8+10)
=1.25×8+1.25×10
=10+12.5
=22.5

9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2

1.24×8.3+8.3×1.76
=8.3×(1.24+1.76)
=8.3×3
=24.9

9999×1001
=9999×(1000+1)
=9999×1000+9999×1
=10008999

14.8×6.3-6.3×6.5+8.3×3.7
=(14.8-6.5)×6.3+8.3×3.7
=8.3×6.3+8.3×3.7
=8.3×(6.3+3.7)
=8.3×10
=83

1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78

933-157-43
=933-(157+43)
=933-200
=733

4821-998
=4821-1000+2
=3823

32×125×25
=4×8×125×25
=(4×25)×(8×125)
=100×1000
=100000

1.8+18÷1.5-0.5×0.3
=1.8+12-0.15
=13.8-0.15
=13.65

6.5×8+3.5×8-47
=52+28-47
=80-47

3.7x2.56-2.3
=9.472-2.3
=7.172

1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78

1/2-(4/5-1/2)
=1/2+1/2-4/5
=1-4/5
=1/5

4800÷25÷4
=4800÷(25x4)
=4800÷100
=4800÷100
=48

2/5-(3/8-3/5)
=2/5+3/5-3/8
=1-3/8
=5/8

3/4-(3/7-1/4)
=3/4+1/4-3/7
=1-3/7
=4/7

3.2x0.125x2.5
=0.125x8x(0.4x2.5)
=1x1
=1

0.4×125×25×0.8
=(0.4×25)×(125×0.8)
=10×100
=1000

1.25×(8+10)
=1.25×8+1.25×10
=10+12.5
=22.5

9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2

1.24×8.3+8.3×1.76
=8.3×(1.24+1.76)
=8.3×3
=24.9

9999×1001
=9999×(1000+1)
=9999×1000+9999×1
=10008999

14.8×6.3-6.3×6.5+8.3×3.7
=(14.8-6.5)×6.3+8.3×3.7
=8.3×6.3+8.3×3.7
=8.3×(6.3+3.7)
=8.3×10
=83

1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78

933-157-43
=933-(157+43)
=933-200
=733

4821-998
=4821-1000+2
=3823

32×125×25
=4×8×125×25
=(4×25)×(8×125)
=100×1000
=100000

9/17x8/13-13/17/8
=9/17x8/13-13/17x1/8
=72/221-13/136
=576/1768-169/1768
=407/1768

9/17x8/13+8/13/(17/8)
=9/17x8/13+8/13x8/17
=8/13x(9/17+8/17)
=8/13x1
=8/13

10.1×89-8.9
=10.1x89-89x0.1
=89x(10.1-0.1)
=89x10
=890

4x+8=4
解：4x=4-8
4x=-4
x=-4÷4
x=-1

12x+8x-12=28
解：20x=28+12
20x=40
x=40÷20
x=2

4x+2.1=8.5
解：4x=8.5-2.1
4x=6.4
x=6.4÷4
x=1.6

65y-30=100
解：65y=100+30
65y=130
y=130÷65
y=2

15x-7.5x=15
解：7.5x=15
x=15÷7.5
x=2

25%x=5
解：1/4x=5
x=5*4
x=20

20-15%x=17
解：0.15x=20-17
0.15x=3
x=3÷0.15
x=20

25%x=5
解：0.25x=5
x=5÷0.25
x=20

80%X=6/15X+96
解：4/5X=2/5X+96
4/5X-2/5X=96
2/5X=96
X=96*5/2
X=48*5
X=240

15%X+10-X=10*32%
解：0.15X-X=3.2-10
-0.85X=-6.8
X=-6.8÷(-0.85)
X=8

15%X+10-X=10*32%
解：0.15X+10-X=3.2
X-0.15X=10-3.2
0.85X=6.8
X=6.8÷0.85
X=8

8÷x=0.4
解：8÷x*x=0.4*x
0.4x=8
0.4x÷0.4=8÷0.4
x=20

5x+8x=4.7
解：13x=4.7
x=4.7/13
x=47/130

2*20x=10(60-x)
解：40x=600-10x
40x+10x=600
50x=600
x=600÷50
x=12

x÷75+x÷60=36
解：1/75x+1/60x=36
4/300x+5/300x=36
9/300x=36
x=36*300/9
x=12*100
x=1200

x-0.7x=16
解：(1-0.7)x=16
0.3x=16
x=16÷0.3
x=16/0.3
x=160/3

8(x-4)+5=45
解：8(x-4)=45-5
8(x-4)=40
x-4=40÷8
x-4=5
x=5+4
x=9

(x+10)*2.4+4=x+25+10
解：2.4x+24+4=x+35
2.4x+28=x+35
2.4x-x=35-28
1.4x=7
x=7÷1.4
x=5

4x+8=4
解：4x+8-8=4-8——等式性质
4x=-4
4x÷4=-4÷4
x=-1

7.8x-14=40
解：7.8x=40+14
7.8x=54
x=54/7.8
x=540/78
x=90/13

5x+30=6x-10
解：6x-5x=30+10
x=40

4x+8=4——方程两边除以4
解：x+2=1
x=1-2
x=-1

x：6.5=6：4
解：4x=6.5*6
4x=39
x=39/4
x=9.75

8.6x+3*6=52.4
解：8.6x+18=52.4
8.6x=52.4-18
8.6x=34.4
x=34.4÷8.6
x=4

x/5.2-1.6=1.8
解：x/5.2=1.8+1.6
x/5.2=3.4
x=3.4*5.2
x=17.68

225x=239.2x
解：239.2x-225x=0
14.2x=0
x=0÷14.2
x=0

80x+(80-20)(x+10)=4800
解：80x+60(x+10)=4800
80x+60x+600=4800
140x=4800-600
140x=4200
x=4200÷140
x=30

1.5x-0.6*15=18
解：1.5x-9=18
1.5x=18+9
1.5x=27
x=27÷1.5
x=18

6x+4(2x-1)+3(45-3x)=171
解：6x+8x-4+135-9x=171
6x+8x-9x+131=171
5x=171-131
5x=40
x=40÷5
x=8

9x*2+18*6x+17*2x=12.8
解：(18+108+34)x=12.8
160x=12.8
x=12.8÷160
x=0.08

1-4*[1/x+1/(x+5)]=(x-4)*[1/(x+5)]
解：x(x+5)-[4(x+5)+4x]=x(x-4)
x²+5x-(4x+20+4x)=x²-4x
x²+5x-8x-20=x²-4x
x²-x²-3x+4x-20=0
4x-3x=20
x=20

2x*(x-1)-x*(2x+3)=15
解：2x²-2x-2x²-3x=15
-5x=15
x=15÷（-5）
x=-3

2分之x+5分之1=3分之1x
解：2分之1x-3分之1x=-5分之1
6分之3x-6分之2x=-5分之1
6分之1x=-5分之1
x=-5分之1*6
x=-5分之6
x=-1又5分之1

8(3x+3)=72
解：3x+3=72÷8
3x+3=9
3x=9-3
3x=6
x=6÷3
x=2

8(3x+3)=72
解：24*(x+1)=72
x+1=72÷24
x+1=3
x=3-1
x=2

8(3x+3)=72
解：24x+24=72
24x=72-24
24x=48
x=48÷24
x=2

4(y+2)=24
解：y+2=24÷4
y+2=6
y=6-2
y=4

4(y+2)=24
解：4y+8=24
4y=24-8
4y=16
y=16÷4
y=4

3x+12.4=5x-3.6
解：5x-3x=12.4+3.6
2x=16
x=16÷2
x=8

x-80%x-6=16
解：x-0.8x=16+6
0.2x=22
x=22÷0.2
x=110

x-0.1x=55.404
解：(1-0.1)x=55.404
0.9x=55.404
x=55.404÷0.9
x=61.56

x+12−1/4x=1
解：x-1/4x=1-12
3/4x=-11
x=-11*4/3
x=-44/3

9分之8÷(2x)=8分之5
解：8分之5*2x=9分之8
4分之5x=9分之8
x=9分之8*5分之4
x=45分之32

5x+30=6x-10
解：6x-5x=30+10
x=40

22%x=34
解：11/50x=34
x=34*50/11
x=1700/11

7分之2x：3分之2=6
解：7分之2x=6*3分之2
7分之2x=4
x=4*2分之7
x=14

0.5x+3分之1x=9分之5
解：2分之1x+3分之1x=9分之5
6分之3x+6分之2x=9分之5
6分之5x=9分之5
x=9分之5*5分之6
x=3分之2

2x-20%×10=4.22
解：2x-2=4.22
2x=4.22+2
2x=6.22
x=6.22÷2
x=3.11

(1-65%)*X=8
解：(1-0.65)X=8
0.35X=8
X=8÷0.35
X=800/35
X=160/7

3分之2X=9分之4
解：X=9分之4*2分之3
X=3分之2

3分之2X+4分之1=12
解：3分之2X=4分之48-4分之1
3分之2X=4分之47
X=4分之47*2分之3
X=8分之141

3X-7分之5X=7分之2
解：7分之21X-7分之5X=7分之2
7分之16X=7分之2
X=7分之2*16分之7
X=8分之1

3X+5=5X-1
解：5X-3X=5+1
2X=6
X=6÷2
X=3

4x-1.5x=5
解：2.5x=5
x=5÷2.5
x=2

X+3.6＝2.5X-3.6
解：2.5X-X=3.6+3.6
1.5X=7.2
X=7.2÷1.5
X=4.8

x+3.6=2.5x-3.6
解：2.5x-x=3.6+3.6
1.5x=7.2
x=7.2÷1.5
x=4.8

x-470.25=182
解：x=182+470.25
x=652.25

x÷4=6.34
解：x=6.34*4
x=25.36

8（x+2.4）=83.2
解：x+2.4=83.2÷8
x+2.4=10.4
x=10.4-2.4
x=8

7分之2x=21分之8
解：x=21分之8*2分之7
x=3分之4
x=1又3分之1

9分之8÷2x=8分之5
解：9分之8*2分之1x=8分之5
9分之4x=8分之5
x=8分之5*4分之9
x=32分之45

3.2+2x=9.8
解：1.6+x=4.9
x=4.9-1.6
x=3.3

1/3x-1/4x=12
解：4/12x-3/12x=12
1/12x=12
x=12*12
x=144

1/6x+2/3x=20
解：1/6x4/6x=20
5/6x=20
x=20*6/5
x=4*6
x=24

1/2x+1/3x=5/6
解：(1/2x+1/3x)×6=5/6×6
3x+2x=5
5x=5
x=5÷5
x=1

2x/3+5x/7=23/42
解：(2x/3+5x/7)×42=23/42×42
28x+30x=23
58x=23
x=23/58

5/6-x=1/4
解：x=5/6-1/4
x=10/12-3/12
x=7/12

x÷4/5=2/7
解：x=2/7×4/5
x=8/35

19/8-1/7x=1/8
解：1/7x=9/4
x=63/4
x=15又3/4

14+5x=42
解：5x=42-14
5x=28
x=28/5
x=5.6

7×5+65x=100
解：35+65x=100
65x=100-35
x=65/65
x=1

4x-8*7=28
解：4x=28+56
x=84/4
x=21

8x-x+18=67
解：7x+18=67
7x=67-18
7x=49
x=49÷7
x=7

x+15=200
解：x=200-15
x=185

x/2+x/3=5/6
解：(x/2+x/3)×6=5/6×6
3x+2x=5
5x=5
x=5÷5
x=1

2x/3+5x/7=23/42
解：(2x/3+5x/7)×42=23/42×42
28x+30x=23
58x=23
x=23/58

5*8+2X=60
解：40+2X=60
2X=60-40
X=20÷2
X=10

5（8+2X）=60
解：8+2X=60÷5
8+2X=12
2X=12-8
X=4÷2
X=2

5(8+2X)=60
解：8+2X=60÷5
8/2+2X/2=12/2
4+X=6
X=6-4
X=2

X-5%X=12.6
解：0.95X=12.6
X=12.6/0.95
X=1260/95
X=252/19

5分之3÷5分之6-3X=5分之1
解：3X=5分之3*6分之5-5分之1
3X=2分之1-5分之1
3X=10分之5-10分之2
3X=10分之3
X=10分之3*3分之1
X=10分之1

(X+5分之3)*50%=4
解：X+5分之3=4÷0.5
X=8-5分之3
X=7又5分之2

5分之4X-4=60
解：5分之4X=60+4
X=64*4分之5
X=16*5
X=80

1÷(X-3分之2X)=5分之4
解：5分之4*3分之1X=1
15分之4X=1
X=1*4分之15
X=4分之15

3.2+2x=9.8
解：2x=9.8-3.2
2x=6.6
x=6.6÷2
x=3.3

(8+x)*3=60
解：8+x=60÷3
8+x=20
x=20-8
x=12

(8+x)*3=60
解：24+3x=60
3x=60-24
3x=36
x=36÷3
x=12

Answer 2

因式分解
X^2-X-6=22X^2-3X-2=0
-3X^2+6X=22
4X^2-4X+1=20
X^2-2X+3=201
-X^2-2X+8=340
X^2-X-2=44
2X^2-3X+1=30
-3X^2+4X+4=50
4X^2-11X-3=3
x^2-2x-3=30
4x^2-1=10
5x^2-3x+2=30
-x^2-2x+8=10
-2x2+x+3=20
2x^2+3x-9=30
x^2-9=10
4x^2-10x-6=30
5x^2-8x-4=10
3x^2+4x-4=30
6x^2+7x-5=10
x^2-8x+12=30
2x^2-6x+3=10
2x^2+9x-5=10
3x^2-16x+5=30
2x^2-11x+5=30
4x^2-16x+7=50
10x^2-9x-7=30
2x^2-13x-7=40
2x^2-3x-2=80
-2x^2+3x-1=450
2x^2-17x-9=890
2x^2-x-6=560
12x^2+16x-3=650
6x^2-13x+2=540
3x^2-7x+2=450
5x^2-11x+2=650
2x^2-9x+9=50
2x^2+3x-9=650
x^2+2x-3=850
x^2-6x+5=260
x^2-3x+2=250
x^2-12x+32=540
x^2+6x-16=230
3x^2-12x-15=110
2x^2-11x-21=310
方程的.
1，x-y=2
xy=15 (x=5,y=3)
2,x+y=6
x-y=2 (4,2)
3,x+y=11,xy=30 (x=5,y=6,x=6,y=5)
4,x+y=13,xy=42 (x=6,7,y=7,6)
5,x+y=11,x-y=1 (x=6,y=5)
6,x+y=12,xy=35 (x=5,7,y=7,5)
7,x+y=5,xy=6 (x=2,3,y=3,2)
8,x-y=5,xy=36 (x=6,y=1)
9,x+y=10,xy=25 (x=y=5)
10,x+y=17,y-x=1 (x=8,y=9)
11,xy=2,x-y=1 (x=2,y=1)
12,x+y=3,xy=2 (x=1,2,y=2,1)
13,x+y=12,xy=11 (x=1,11,y=11,1)
14,x-y=8,xy=9 (x=9,y=1)
15,x+y=4,x-y=2 (x=3,y=1)
16,x+y=3,xy=0 (x=0,3,y=3,0)
17,x-y=5,xy=6 (x=6,y=1)
18,y-x=3,xy=28 (x=4,y=7)
19,y-x=2,xy=24 (x=4,y=6)
20,x+y=9,x-y=1, (x=5,y=4)
21. 66x+17y=3967 25x+y=1200 答案：x=48 y=47
22. 18x+23y=2303 74x-y=1998 答案：x=27 y=79
23. 44x+90y=7796 44x+y=3476 答案：x=79 y=48
(4) 76x-66y=4082 30x-y=2940 答案：x=98 y=51
(5) 67x+54y=8546 71x-y=5680 答案：x=80 y=59
化简求值
^代表平方 1.已知|a+3|+(b-1)^=0,求3a^-2ab+b^的值。
2.已知（a-1)^+4(b+2)+|c+1|=0,求(a^-ac+c^)-2(a^+bc-2c^)的值。
3.（3x^-2y^-3xy)-(2x^-3y^+xy),其中x^+y^=2,xy=-1.
4.(-a^-ab+b^)-(-a^+2ab+b^),其中a=-1/15,b=10.
5.已知：|a+1/2|+(b-3)^=0,求代数式[(2a+b)^+(2a+b)(b-2a)-6b]\(2b)的值。 6.10a(5乘以a的平方-b)-2a(5b+25乘以a的平方）－3ab,其中a=1,b=1/23. 7.1/3x^3-2x^2+2/3x^3+3x^2+5x-4x+7,(x=2) 先化简,再求值.
8.5abc-{2a²b[3abc-(4ab²-a²b)]-2ab²}其中a=-2,b=3,c=-1/4.
9.已知a²+a-1=0,求代数式a³+2a²+5的值.
10.(a+2)的二次方-(a-1)(a+1),其中a＝3．25 先化简再求值
11.（X-1)的二次方+(x+3)(x-3)+(x-3)(x-1),其中X的二次方-2x=2
12.已知:a+b=12,a的平方+b的平方=74 求ab的值
13.先化简,再求值 (4x-3y)的平方-(3x-2y)(3x+2y),其中x=2,y=1
14.化简求值：（1 + a - 5a）-（- a +2a ），其中a= - 3
15.已知3分之a=4分之b=5分之c，求代数式2b-a分之2a+b+c的值
16.（x－3）2＋|y＋2|=0则yx的值为（ ）
17.设a,b,c为有理数,且|a|+a=0,|ab|=ab,|c|-c=0 求式子|b|-|a+b|-|c-b|+|a-c|的值
18.9x+6x^2-3(x-2/3x^2),其中x=-2 9x+6x^2-3x+11/3x^2=6x+29/3x^2=6*(-2)+29/3*(-2)=-12-58/3=-94/3
19.1/4(-4x^2+2x-8)-(1/2x-1),其中x=1/2 -x^2+1/2x-2-1/2x+1=-1/2^2+1/4-2-1/4+1=1/4-1=-3/4
20.(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1 5a^2-3b^2+a^2+b^2-5a^2-3b^2=5-3+1+1-5-3=-6+2=-4
21.2(a^2b+ab^2)-2(a^2b-1)-2ab^2-2,其中a=-2,b=2 2a^2*2b+2ab^2-2a^2*2b*2-2ab^2-2=8*4-4*4-2=-18

Answer 3

5.4÷1.8+240×1.5
=3+360
=3639000÷72×(1.25×0.7×8)
=9000÷72×7
=125×7
=87561-(1.25+2.5×0.7)
=61-3
=58[(10-0.8)+9.85]-2÷0.125
=19.05-2÷0.125
=19.05-16
=3.05
08－12×24
=
408
-
288
=
120（46＋28）×60
=
74
x
60
=
444042×50－17
=
2100-
17
=
208332＋105÷5
=
32
+
21
=
53420×（327－238）
=
420
x
89
=
37380(4121+2389)÷7
=
6510
÷7
=
9303.416÷（0.016×35）
=
3.416
÷0.56
=
6.10.8×[(10－6.76)÷1.2]
=
0.8
x(3.24÷1.2)
=
0.8
x
2.7
=
2.165.67×0.2-0.62
=
1.134-0.62
=
0.5140.4×0.7×0.25
=
0.4
x
0.25
x
0.7
=
0.1
x
0.7
=
0.070.78+5.436+1
=
6.216
+1
=
7.21630.8÷[14－(9.85＋1.07)]
=
30.8
÷
(14
-
10.92)
=
30.8÷3.08
=
10[60－(9.5＋28.9)]÷0.18
=
(60-
38.4)÷0.18
=
21.6
÷0.18
=
1202.881÷0.43－0.24×3.5
=
6.7
-
0.24
x3.5
=
6.7
-
0.84
=
5.8620×[(2.44－1.8)÷0.4＋0.15]
=
20x
(0.64
÷0.4
+0.15)=
20x(1.6
+0.15)
=
20
x1.75
=
3528-(3.4+1.25×2.4)
=
28
-
(3.4
+
3)
=
28
-
6.4
=
21.62.55×7.1+2.45×7.1
=
(2.55
+
2.45)
x7.1
=
5
x7.1=35.50.8×〔15.5-(3.21+5.79)〕
=
0.8
x
(15.5
-
9)
=
0.8
x
6.5
=
5.2（31.8+3.2×4）÷5
=
(31.8
+
12.8)÷5
=
44.6÷5
=
8.9231.5×4÷(6+3)
=
126
÷
9
=
142÷2.5+2.5÷2
=
0.8
+
1.25
=2.05194－64.8÷1.8×0.9
=
194
-36
x0.9
=
194-32.4
=
161.65180－705×6
=
5180
-
4230=95024÷2.4－2.5×0.8
=10
-2=8405×(3213-3189)
=405x24
=
9720125×(97-81)
=125x16
=20006942+480÷3
=
6942
+
160
=
678220+80÷4-20
=
20
+
20
-20
=
40
-20
=
20100÷（32-30）×0
=
100
÷2
x0=
50
x0
=
025×4-12×5
=
100
-
60
=
4070×〔（42-42）÷18〕=70
x
(0÷18)
=
70x0
=
075×65+75×35
=
75
x
(65
+35)
=
75x100
=
7500
6-1.6÷4=
6-
0.4
=
5.65.38+7.85-5.37=
13.23
-
5.37=7.867.2÷0.8-1.2×5=9
-
6
=36-1.19×3-0.43=
6-3.57
-
0.43
=
6-
(3.57
+
0.43)
=
6-4
=
26.5×（4.8-1.2×4）=
6.5
x(4.8
-
4.8
)=6.5
x0
=
00.68×1.9+0.32×1.9
=
(0.68
+
0.32)
x1.9
=
1
x
1.9
=
1.910.15-10.75×0.4-5.7
=
10.15
-
4.3
-
5.7
=
10.15
-(4.3
+
5.7)=10.15
-
10
=0.155.8×（3.87-0.13）+4.2×3.74
=
5.8
x
3.74
+4.2
x
3.74
=
(5.8
+4.2)x3.74
=
10
x
3.74
=
37.432.52-（6+9.728÷3.2）×2.5
=
32.52
-
(6+3.04)x2.5
=
32.52
-
9.02
x
2.5
=
32.52
-22.55
=
9.97（136+64）×（65-345÷23）=
200x(65-15)
=
200x
50=10000

Answer 4

这些题目加起来值1000分了

Answer 5

因式分解
X^2-X-6=0
2X^2-3X-2=0
-3X^2+6X=2
4X^2-4X+1=0
X^2-2X+3=0
-X^2-2X+8=0
X^2-X-2=4
2X^2-3X+1=0
-3X^2+4X+4=0
4X^2-11X-3=3
x^2-2x-3=0
4x^2-1=0
5x^2-3x+2=0
-x^2-2x+8=0
-2x2+x+3=0
2x^2+3x-9=0
x^2-9=0
4x^2-10x-6=0
5x^2-8x-4=0
3x^2+4x-4=0
6x^2+7x-5=0
x^2-8x+12=0
2x^2-6x+3=0
2x^2+9x-5=0
3x^2-16x+5=0
2x^2-11x+5=0
4x^2-16x+7=0
10x^2-9x-7=0
2x^2-13x-7=0
2x^2-3x-2=0
-2x^2+3x-1=0
2x^2-17x-9=0
2x^2-x-6=0
12x^2+16x-3=0
6x^2-13x+2=0
3x^2-7x+2=0
5x^2-11x+2=0
2x^2-9x+9=0
2x^2+3x-9=0
x^2+2x-3=0
x^2-6x+5=0
x^2-3x+2=0
x^2-12x+32=0
x^2+6x-16=0
3x^2-12x-15=0
2x^2-11x-21=0
方程的.
1，x-y=2
xy=15 (x=5,y=3)
2,x+y=6
x-y=2 (4,2)
3,x+y=11,xy=30 (x=5,y=6,x=6,y=5)
4,x+y=13,xy=42 (x=6,7,y=7,6)
5,x+y=11,x-y=1 (x=6,y=5)
6,x+y=12,xy=35 (x=5,7,y=7,5)
7,x+y=5,xy=6 (x=2,3,y=3,2)
8,x-y=5,xy=36 (x=6,y=1)
9,x+y=10,xy=25 (x=y=5)
10,x+y=17,y-x=1 (x=8,y=9)
11,xy=2,x-y=1 (x=2,y=1)
12,x+y=3,xy=2 (x=1,2,y=2,1)
13,x+y=12,xy=11 (x=1,11,y=11,1)
14,x-y=8,xy=9 (x=9,y=1)
15,x+y=4,x-y=2 (x=3,y=1)
16,x+y=3,xy=0 (x=0,3,y=3,0)
17,x-y=5,xy=6 (x=6,y=1)
18,y-x=3,xy=28 (x=4,y=7)
19,y-x=2,xy=24 (x=4,y=6)
20,x+y=9,x-y=1, (x=5,y=4)
21. 66x+17y=3967 25x+y=1200 答案：x=48 y=47
22. 18x+23y=2303 74x-y=1998 答案：x=27 y=79
23. 44x+90y=7796 44x+y=3476 答案：x=79 y=48
(4) 76x-66y=4082 30x-y=2940 答案：x=98 y=51
(5) 67x+54y=8546 71x-y=5680 答案：x=80 y=59
化简求值
^代表平方 1.已知|a+3|+(b-1)^=0,求3a^-2ab+b^的值。
2.已知（a-1)^+4(b+2)+|c+1|=0,求(a^-ac+c^)-2(a^+bc-2c^)的值。
3.（3x^-2y^-3xy)-(2x^-3y^+xy),其中x^+y^=2,xy=-1.
4.(-a^-ab+b^)-(-a^+2ab+b^),其中a=-1/15,b=10.
5.已知：|a+1/2|+(b-3)^=0,求代数式[(2a+b)^+(2a+b)(b-2a)-6b]\(2b)的值。 6.10a(5乘以a的平方-b)-2a(5b+25乘以a的平方）－3ab,其中a=1,b=1/23. 7.1/3x^3-2x^2+2/3x^3+3x^2+5x-4x+7,(x=2) 先化简,再求值.
8.5abc-{2a²b[3abc-(4ab²-a²b)]-2ab²}其中a=-2,b=3,c=-1/4.
9.已知a²+a-1=0,求代数式a³+2a²+5的值.
10.(a+2)的二次方-(a-1)(a+1),其中a＝3．25 先化简再求值
11.（X-1)的二次方+(x+3)(x-3)+(x-3)(x-1),其中X的二次方-2x=2
12.已知:a+b=12,a的平方+b的平方=74 求ab的值
13.先化简,再求值 (4x-3y)的平方-(3x-2y)(3x+2y),其中x=2,y=1
14.化简求值：（1 + a - 5a）-（- a +2a ），其中a= - 3
15.已知3分之a=4分之b=5分之c，求代数式2b-a分之2a+b+c的值
16.（x－3）2＋|y＋2|=0则yx的值为（ ）
17.设a,b,c为有理数,且|a|+a=0,|ab|=ab,|c|-c=0 求式子|b|-|a+b|-|c-b|+|a-c|的值
18.9x+6x^2-3(x-2/3x^2),其中x=-2 9x+6x^2-3x+11/3x^2=6x+29/3x^2=6*(-2)+29/3*(-2)=-12-58/3=-94/3
19.1/4(-4x^2+2x-8)-(1/2x-1),其中x=1/2 -x^2+1/2x-2-1/2x+1=-1/2^2+1/4-2-1/4+1=1/4-1=-3/4
20.(5a^2-3b^2)+(a^2+b^2)-(5a^2+3b^2),其中a=-1,b=1 5a^2-3b^2+a^2+b^2-5a^2-3b^2=5-3+1+1-5-3=-6+2=-4
21.2(a^2b+ab^2)-2(a^2b-1)-2ab^2-2,其中a=-2,b=2 2a^2*2b+2ab^2-2a^2*2b*2-2ab^2-2=8*4-4*4-2=-18