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1.25×4.8×2.5,有几种简便方法?
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1.25×4.8×2.5 = 1.25×0.8×6×2.5 = 1×15 = 15
1.25×4.8×2.5 = 1.25×8×0.6×2.5 = 10×1.5 = 15
1.25×4.8×2.5 = (5/4)×(24/5)×(5/2)= 15
1.25×4.8×2.5 = 1.25×8×0.6×2.5 = 10×1.5 = 15
1.25×4.8×2.5 = (5/4)×(24/5)×(5/2)= 15
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