7/5-9/4x5/7怎样计算?
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7/5-9/4x5/7怎样计算?
7/5-9/4x5/7怎样计算?
7/5-9/4x5/7怎样计算?
5/7-4/9×5/7
=5/7×(1-4/9)
=5/7×5/9
=25/63
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