17/5×18-17/5等于多少,算是

问题描述:

17/5×18-17/5等于多少,算是

把17/5提出来然后乘以(18减去1)

17/5×18-17/5
=17/5×18-17/5×1
=17/5×(18-1)
=17/5×17
=57.8