2.75×0.25+7.25×4简便计算？
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2.75x0.25+7.25x4
=2.75ⅹ0.25+（7+0.25）x4
=2.75x0.25+0.25x4+7x4
=0.25ⅹ（2.75+4）+28
=0.25x6.75+28
=1.6875+28
=29.6875
=2.75ⅹ0.25+（7+0.25）x4
=2.75x0.25+0.25x4+7x4
=0.25ⅹ（2.75+4）+28
=0.25x6.75+28
=1.6875+28
=29.6875
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