3.28×0.75+1.72×1/4简便计算？
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3.28×0.75+1.72×1/4
=3.28×0.75+1.72×0.25
=3.28×（0.5+0.25）+1.72×0.25
=3.28×0.5+3.28×0.25+1.72×0.25
=1.64+（3.28+1.72）×0.25
=1.64+5×0.25
=1.64+1.25
=2.89
=3.28×0.75+1.72×0.25
=3.28×（0.5+0.25）+1.72×0.25
=3.28×0.5+3.28×0.25+1.72×0.25
=1.64+（3.28+1.72）×0.25
=1.64+5×0.25
=1.64+1.25
=2.89
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