3.4x80%+0.8+80%x5.5简便运算
问题描述:
3.4x80%+0.8+80%x5.5简便运算
答
3.4x80%+0.8+80%x5.5
=3.4×0.8+0.8+0.8×5.5
=0.8×(3.4+1+5.5)
=0.8×9.9
=0.8×(10-0.1)
=0.8×10-0.8×0.1
=8-0.08
=7.92