12.8×0.75+2.5×1.28简便运算

问题描述:

12.8×0.75+2.5×1.28简便运算

12.8×0.75+2.5×1.28
=1.28×7.5+1.26×2.5
=1.28×(7.5+2.5)
=1.28×10
=12.8