1.简便方法计算下面各题。 101X9.87 1.25X0.25X3.2

1.简便方法计算下面各题。 101X9.87 1.25X0.25X3.2 200.2X7.8一7.8X0.2
2024-11-29 21:25:46
推荐回答(1个)
回答(1):

101X9.87
=(100+1)×9.87
=100×9.87+9.87
=987+9.87
=996.87

1.25X0.25X3.2
=(1.25×0.8)×(0.25×4)
=1×1
=1

200.2X7.8一7.8X0.2

=(200.2-0.2)×7.8
=200×7.8
=156