5/12+7/12×4/7用简便算法?
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5/12+7/12×4/7
=5/12+(7/12×4/7)
=5/12+(7×4)/(12x7)=5/12+4/12=9/12=3/4
=5/12+(7/12×4/7)
=5/12+(7×4)/(12x7)=5/12+4/12=9/12=3/4
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5/12 + (7/12)×4/7
= (1/12) x (5 + 7×4/7) = (1/12) x 9 = 3/4
= (1/12) x (5 + 7×4/7) = (1/12) x 9 = 3/4
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