计算 0.25*(-2.15)+0.75*(+3.15)/3=?

问题描述:

计算 0.25*(-2.15)+0.75*(+3.15)/3=?

0.25*(-2.15)+0.75*(+3.15)/3
= 0.25*(-2.15)+0.25*3*(+3.15)/3
=0.25*(-2.15)+0.25*(+3.15)
=0.25*(3.15-2.15)
=0.25