(7.9-2.4-3.6)*2.5怎么简算
问题描述:
(7.9-2.4-3.6)*2.5怎么简算
答
《7.9-(2.4+3.6)》*2.5
=3.9*2.5
=3.9*10/4
=39/4
=9.75
或者=39/4=(40-1)/4=40/4 - 1/4=10-0.25=9.75