LÀM ƠN GIÚP MÌNH VỚI!!! Cho A=$\frac{x+2}{x²+2x+1}$ -$\frac{2}{x+1}$ và B=$\frac{x}{x²-1}$, x $\neq$ ± 1 a, Giá trị của B khi x=2. b, Rút gọn biểu thức A. c,Biết P=A:B, điều kiện xác định của P. d, Rút gọn biểu thức P. e, Khi P= $\frac{1}{2}$ thì x=? f,Các giá trị nguyên của x để P có giá trị nguyên.

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