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用简便方法计算7.4+0.34%7.4+0.034

300.7×20.5-30.07×205 =300.7×20.5-300.7×20.5 =300.7×(20.5-20.5) =300.7×0 =0 3.4×6.7+0.34×32+0.034×10 =3.4×6.7+3.4×3.2+3.4×0.1 =3.4×(6.7+3.2+0.1) =3.4×10 =34

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