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5. 1/ab
6. ab(a-b)²(a+b) / b(a²-b²)(a-b) =
tinggal corat coret jadinya a(a-b)(a+b)/a²-b² = a
7. x+1/x² + 4x + 4 dikali x+2/x² + 6x + 9 dikali x+3/(x+1)²
(x+1)(x+2)(x+3) / (x+2)²(x+3)²(x+1)² =
1/ (x+1)(x+2)(x+3)