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36×2.5;(12.5+0.25)×8;0.125×7.2;401×0.32简便计算

来源:学生作业帮 编辑:拍题作业网作业帮 分类:数学作业 时间:2024/05/05 23:52:40
36×2.5;(12.5+0.25)×8;0.125×7.2;401×0.32简便计算
题目有一点多,不过,我会加分的,谢谢~~~~~
36×2.5
=9x4x2.5
=9x10
=90
(12.5+0.25)×8
=12.5x8+0.25x4x2
=100+1x2
=102
0.125×7.2
=0.125x8x0.9
=1x0.9
=0.9
401×0.32
=400x0.32+1x0.32
=128+0.32
=128.32