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Cho biểu thức P=($\frac{x+1}{x}$ - $\frac{1}{1-x}$ + $\frac{2-x^2}{x^2-x}$ )=$\frac{x}{x-1}$ a.Tìm điều kiện x để giá trị P được xác định và chứng minh P = $\frac{x+1}{x^2}$ b.Tính giá trị của P với x thỏa mãn / 2x-1/=3 c. Tìm giá trị nhỏ nhất của P
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