(a²-2ab+b²)/a-b=a²-b²/( )

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

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

(a²-2ab+b²)/a-b=a²-b²/( )
a²-2ab+b²
=(a-b)²
(a-b)²/a-b
=a-b
a²-b²
=(a+b)(a-b)
∴(a²-2ab+b²)/a-b=a²-b²/(a+b )
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