7.5X2.3+1.9X2.5+12.5X2.5 简便计算
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解:原式=2.5x3x2.3+1.9x2.5+12.5x2.5
=2.5x(3x2.3)+1.9x2.5+12.5x2.5
=2.5x6.9+1.9x2.5+12.5x2.5
=2.5x(6.9+1.9+12.5)
=2.5x21.3
=2.5x4x5.325
=10x5.325
=53.25
=2.5x(3x2.3)+1.9x2.5+12.5x2.5
=2.5x6.9+1.9x2.5+12.5x2.5
=2.5x(6.9+1.9+12.5)
=2.5x21.3
=2.5x4x5.325
=10x5.325
=53.25
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