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P=(x/x-3 - 2/x+3 - x^2/9-x^2) : x+6/3x+9 a. Rút gọn P b. Tính giá trị của P biết 2x-|4-x|=5 c. Tìm x để P có giá trị nguyên d. tìm x để p^2-p+1 có giá trị nhỏ nhất
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