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=?
答
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