(0.75×42.7+57.3-0.573×25)÷3×7972怎样做简便
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(0.75×42.7+57.3-0.573×25)÷3×7972
=(0.75×42.7+57.3-57.3×0.25)÷3×7972
=【0.75×42.7+57.3（1-0.25)】÷3×7972
=【0.75×42.7+57.3×0.75】÷3×7972
=【0.75（42.7+57.3）】÷3×7972
=0.75×100÷3×7972
=25×7972=199300
=(0.75×42.7+57.3-57.3×0.25)÷3×7972
=【0.75×42.7+57.3（1-0.25)】÷3×7972
=【0.75×42.7+57.3×0.75】÷3×7972
=【0.75（42.7+57.3）】÷3×7972
=0.75×100÷3×7972
=25×7972=199300
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