(a+b)²(a-b)³/(a²-b²)²=

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(a+b)²(a-b)³/(a²-b²)²=

(a+b)²(a-b)³/(a²-b²)²=
(a+b)²(a-b)³/(a²-b²)²=

(a+b)²(a-b)³/(a²-b²)²=
原式=(a+b)²(a-b)³/(a²-b²)²
=(a+b)²(a-b)³/(a+b)²(a-b)²
=a-b