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2016-09-17
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1.25*0.7 +1.25*1.2 +12.5的简便
=1.25x(0.7+1.2)+12.5
=1.25x1.9+12.5
=1.25x2-1.25x0.1+12.5
=2.5+12.5-0.125
=15-0.125
=14.875
=1.25x(0.7+1.2)+12.5
=1.25x1.9+12.5
=1.25x2-1.25x0.1+12.5
=2.5+12.5-0.125
=15-0.125
=14.875
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