有理数简便运算.-3-[-5+(1-0.2乘3/5)除以(-2)]

问题描述:

有理数简便运算.-3-[-5+(1-0.2乘3/5)除以(-2)]

-3-[-5+(1-0.2乘3/5)除以(-2)]
=-3-[-5+(1-3/25)除以(-2)]
=-3-[-5+22/25)除以(-2)]
=-3-[-5-11/25]
=-3+5+11/25
=2又11/25