1.25×﹙7.4×9﹚用简便方法计算

来源:学生作业学帮网 编辑:学帮网 时间:2024/05/14 18:31:28

1.25×﹙7.4×9﹚用简便方法计算

1.25×﹙7.4×9﹚
=1.25×7.4×(8+1)
=1.25×7.4×8+1.25×7.4×1
=10×7.4+1.25×7.4
=74+1.25×(8-0.6)
=74+1.25×8-1.25×0.6
=74+10-0.75
=83.25