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(2.9-2.9x0.9)/(3.7-2.7)(25+2.5+0.25)x4怎么用简便方法

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/01 08:37:22
(2.9-2.9x0.9)/(3.7-2.7)(25+2.5+0.25)x4怎么用简便方法
是一道题还是两道题?
(2.9-2.9x0.9)/(3.7-2.7)
=[2.9×(1-0.9)]/1
=2.9×0.1
=0.29
(25+2.5+0.25)x4
=25×4+2.5×4+0.25×4
=100+10+1
=111
(2.9-2.9x0.9)/(3.7-2.7)(25+2.5+0.25)x4
=0.29×(100+10+1)
=29+2.9+0.29
=31.9+0.29
=32.19