Question

（1+0.23+0.34）×（0.23+0.34+0.56）-（1+0.23+0.34+0.56）×(0.23+0.34)

Answer 1

等于0.56
简便算法：
原式=1x(0.23+0.34+0.56)+（0.23+0.34）x(0.23+0.34+0.56)-1x(0.23+0.34)-(0.23+0.34+0.56)x(0.23+0.34)
=1x(0.23+0.34+0.56)-1x(0.23+0.34)+（粗尘0.23+0.34）x(0.23+0.34+0.56)-(0.23+0.34+0.56)x (0.23+0.34)
=1x(0.23+0.34)-1x(0.23+0.34)+1x0.56+（镇洞0.23+0.34）x(0.23+0.34+0.56)-(0.23+0.34+0.56)x (0.23+0.34)
=0.56
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Answer 2

设0.23+0.34为x，则
原式毕裤=（x+1）（x+0.56）拍数滚-（袭余x+1+0.56）×x
=(x²+0.56x+x+0.56)-(x²+0.56x+x)
=0.56

Answer 3

原式
=1.57x1.13-2.13x0.57
=0.56