五分之九乘以25%加十分之一乘以2.2减0.25用最简便方法计算怎么写
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9/5×25%+1/10×2.2-0.25
=(9/5-1)×0.25+1/10×2.2
=4/5×0.25+1/5×1.1
=1/5×1+1/5×1.1
=1/5×(1+1.1)
=1/5×2.1
=21/50
=(9/5-1)×0.25+1/10×2.2
=4/5×0.25+1/5×1.1
=1/5×1+1/5×1.1
=1/5×(1+1.1)
=1/5×2.1
=21/50
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