（ab分之a²-b²）²（乘a-b分之a）³ 急.

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=(a+b)²(a-b)²/a²b²×a³/(a-b)³
=a(a+b)²/b²(a-b)

（ab分之a²-b²）²（乘a-b分之a）³
=[(a²-b²)²/a²b²]*[a³/(a-b)³]
=[(a+b)²(a-b)²/a²b²]*[a³/(a-b)³]
=a(a+b)²/b²
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a(a十b)^2/(a-b)b^2