Question

简便运算

（1+0.12+0.23+0.34)×(0.12+0.23+0.34+0.45)×(1+0.12+0.23+0.34+0.45)×((0.12+0.23+0.34)
一定要简便运算！！！

Answer 1

(1) 0.12+0.23+0.34
= 0.23-0.11+0.23+0.23+0.11
= 0.23*3
= 0.69

(2)每个括号里都有上面的式子,把结果带进去
(1+0.69)X(0.45+0.69)X(1+0.45+0.69)X0.69
= 1.69*1.14*2.14*0.69
= 2.844818

题目对吗?如果没错的话,应该是4个括号里的数相乘,这部分看不出有何简便算法.抱歉.

Answer 2

(0.12+0.23+0.34)×4+0.45×2+1×2
=0.69×4+0.9+2
=2.76+0.9+2
=3.66+2
=5.66