72×2.09-1.8×73.6 简便运算

来源：学生作业学帮网编辑：学帮网时间：2024/06/16 03:55:15

72*2.09-1.8*73.6
=1.8*40*2.09-1.8*73.6
=1.8*(40*2.09-73.6)
=1.8*(83.6-73.6)
=1.8*10
=18

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