4个数.相加等于24,有多少中方式.2,2,5,5

4个数.相加等于24,有多少中方式.2,2,5,5

本题解答如下:
2*((2+5)+5)
2*(2+(5+5))
2*((2+5)+5)
2*(2+(5+5))
2*((5+2)+5)
2*(5+(2+5))
((2+5)+5)*2
(2+(5+5))*2
2*((5+5)+2)
2*(5+(5+2))
2*((5+2)+5)
2*(5+(2+5))
((2+5)+5)*2
(2+(5+5))*2
2*((5+5)+2)
2*(5+(5+2))
2*((2+5)+5)
2*(2+(5+5))
2*((2+5)+5)
2*(2+(5+5))
2*((5+2)+5)
2*(5+(2+5))
((2+5)+5)*2
(2+(5+5))*2
2*((5+5)+2)
2*(5+(5+2))
2*((5+2)+5)
2*(5+(2+5))
((2+5)+5)*2
(2+(5+5))*2
2*((5+5)+2)
2*(5+(5+2))
((5+2)+5)*2
(5+(2+5))*2
((5+2)+5)*2
(5+(2+5))*2
((5+5)+2)*2
(5+(5+2))*2
(5*5)-(2/2)
((5+5)+2)*2
(5+(5+2))*2
(5*5)-(2/2)
((5+2)+5)*2
(5+(2+5))*2
((5+2)+5)*2
(5+(2+5))*2
((5+5)+2)*2
(5+(5+2))*2
(5*5)-(2/2)
((5+5)+2)*2
(5+(5+2))*2
(5*5)-(2/2)
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第1个回答  2016-12-17
5x5-(2÷2)=25-1=24
第2个回答  2016-12-17
5x5-2÷2=24
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