3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/a
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3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/a
3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/a
3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/a