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简便运算:102.36×49 2.25×1.8+1.25×0.18

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/14 17:44:35
简便运算:102.36×49 2.25×1.8+1.25×0.18
102.36×49
=102.36×(50-1)
=5118-102.36
=5015.64
2.25×1.8+1.25×0.18
=0.18×(2.25x10+1.25)
=0.18×(22.5+1.25)
=0.18×23.75
=0.18×(25-1.25)
4.5-0.225
=4.275