(3/4-1/5÷4)×5/14简便计算,

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答案和解析

原式=（3/4-1/5*1/4）*5/14
=[3/4-(1/4-1/5)]*5/14
=(3/4-1/4+1/5)*5/14
=(1/2+1/5)*5/14
=7/10*5/14
=1/4

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