计算下面各题，能简便的最好用简便方法计算．4.1÷0.41+22.5 &...

Question

计算下面各题，能简便的最好用简便方法计算．4.1÷0.41+22.5 2.01×99+2.015.6×3.9+3.9×4.4 6.9×1.25×0.8．

Answer 1

①4.1÷0.41+22.5
=10+22.5
=32.5                 
②2.01×99+2.01
=2.01×（99+1）
=2.01×100
=201
③5.6×3.9+3.9×4.4
=3.9×（5.6+4.4）
=3.9×10
=39               
④6.9×1.25×0.8
=6.9×（1.25×0.8）
=6.9×1
=6.9