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化简: x 2 - 1 x ÷ x + 1 x = .
计算: 5 c 2 6 ab · 3 b a 2 c = .
分解因式: a x 2 - 2 ax + a = ;计算: 2 x 2 - 1 ÷ 4 + 2 x ( x - 1 ) ( x + 2 ) = .
化简: x + 3 x 2 − 2 x + 1 ÷ x 2 + 3 x ( x − 1 ) 2 = .
x + 1 x · x x 2 + 2 x + 1 = .
化简: x + 3 x 2 - 4 x + 4 ÷ x 2 + 3 x ( x - 2 ) 2 = .
计算: .
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