0.375*85+37.5*0.15 和 4.54*0.7+6.46*0.7-0.7 怎么简便计算 现在就要 拿来救命的哇哇

问题描述:

0.375*85+37.5*0.15 和 4.54*0.7+6.46*0.7-0.7 怎么简便计算 现在就要 拿来救命的哇哇

解0.375*85+37.5*0.15
=37.5*0.85+37.5*0.15
=37.5(0.85+0.15)
=37.5*1
=37.5
4.54*0.7+6.46*0.7-0.7
=0.7(4.54+6.46-1)
=0.7(4.54+5.46)
=0.7*10
=7
不懂请问