1.简便方法计算下面各题. 101X9.87 1.25X0.25X3.21.简便方法计算下面各题. 101X9.871.25X0._数学解答

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. 101X9.871.25X0.25X3.2200.2X7.8一7.8X0.2

人气：174 ℃　时间：2020-08-11 19:10:25

解答

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