计算：a²-b²/ab÷（a-b）²
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计算：a²-b²/ab÷（a-b）²
a²-b²/ab÷（a-b）²
=(a+b)(a-b)/ab ×1/(a-b)²
=(a+b)/ab(a-b)
=(a+b)/(a²b-ab²)
计算：a²-b²/ab÷（a-b）²
a²-b²/ab÷（a-b）²
=(a+b)(a-b)/ab ×1/(a-b)²
=(a+b)/ab(a-b)
=(a+b)/(a²b-ab²)