简便计算(1+023+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)

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简便计算(1+023+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)简便计算(1+023+0.34)*(0.23+0.34+0.65)-(1

简便计算(1+023+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
简便计算(1+023+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)

简便计算(1+023+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
(1+023+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
=(1+023+0.34)*(0.23+0.34+0.65)-(0.23+0.34+0.65)*(0.23+0.34)-(0.23+0.34)
=(0.23+0.34+0.65)*【(1+023+0.34)-(0.23+0.34)】-(0.23+0.34)
=(0.23+0.34+0.65)*1--(0.23+0.34)
=0.65

1

不知道你 读几年级 应该还没有学消元法
(1+023+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
={(0.23+0.34+0.65)+(023+0.34)*(0.23+0.34+0.65)}-{(0.23+0.34)+(0.23+0.34+0.65)*(0.23+0.34)}
=0.65