第1个回答 2012-11-07
1.( 2a+3b)(2a-3b)
2. (1+2c(1+2c)
3. (-x+2)(-x-2)
4.(2a+5b)(2a-5b)
5.(-2a-3b)(-2a+3b
6.1998×2002
7.30.8×29.2
8.(a+2)(a-2)(a2+4)
9.(a+b)(a-b)(a2+b2)
10.(a+b+c)(a+b-c)
11.(a+b-3)(a-b+3)
12.(x-y+z)(x+y-z)
13.(m-n+p)(m-n-p)
14.(ab+1)(-ab+1)
15.(b+2a)(2a-b)
16.(a+b)(-b+a)
17.(-2x+y)(2x+y)
18.(a+b)(-b+a)
19.(4a-1)(-4a-1)
20.498×502
21.30.8×29.2
22.1.01×0.99