简便运算(1+0.12+0.23)X(0.12+0.23+0.34) - (1+0.12+0.34)X(0.12+0.23)

问题描述:

简便运算(1+0.12+0.23)X(0.12+0.23+0.34) - (1+0.12+0.34)X(0.12+0.23)

(1+0.12+0.23)X(0.12+0.23+0.34) - (1+0.12+0.23+0.34)X(0.12+0.23)
=(0.12+0.23+0.34)+(0.12+0.23)×(0.12+0.23+0.34) - (0.12+0.23)-(0.12+0.23+0.34)×(0.12+0.23)
=(0.12+0.23+0.34) - (0.12+0.23)
=0.34请问是不是简便啊? 我怎么看都不像啊呵呵