计算-(-a²/b)²*(-b³/a)³/(ab)
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计算-(-a²/b)²*(-b³/a)³/(ab)
计算-(-a²/b)²*(-b³/a)³/(ab)
计算-(-a²/b)²*(-b³/a)³/(ab)
-(-a²/b)²*(-b³/a)³/(ab)
=
-(a4/b²)*(-b9/a³)/(ab)
=ab7/(ab)
=b的6次方