简便计算
22又1/2×6%+2.75÷1又2/3+1.2
=2.25×0.6+2.75×3/5+0.6×2
=（2.25+2.75+2）×0.6
=7×0.6
=4.2
22又1/2×6%+2.75÷1又2/3+1.2
=2.25×0.6+2.75×3/5+0.6×2
=（2.25+2.75+2）×0.6
=7×0.6
=4.2
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