[5/6一(5/14一2/7)]x7/18的结果是

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[5/6一(5/14一2/7)]x7/18
=[5/6一(5/14一4/14)]x7/18
=[5/6一1/14]x7/18
=[35/42一3/42]x7/18
=32/42 x 7/18
=(32x7) / (42x18)
=224 / 756
=56/189
自己在算一次,看我算错没

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