33/(5/8-3/7)=33/(11/56)=56*3=168

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33/(5/8-3/7)=33/(11/56)=56*3=168

33/(5/8-3/7)
=33/(35/56-24/56),[通分]
=33/(11/56)
=33*56/11,[颠倒相乘]
=3*56
=168