1.5.1÷4+4.9×25%
=5.1×0.25+4.9×0.25
=0.25（5.1+4.9）
=0.25×10
=2.5
2.2又5/1×0.75+2.2×4/1
=2.2×0.75+2.2×0.25
=2.2×（0.75+0.25）
=2.2
用简便方法计算 1.5.1÷4+4.9×25% 2.2又5/1×0.75+2.2×4/1 要交的.快.
用简便方法计算 1.5.1÷4+4.9×25% 2.2又5/1×0.75+2.2×4/1 要交的.快.
数学人气：323 ℃时间：2020-04-14 21:39:30
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