(x-1/x平方-6x+9)-(1/x-3)-(2x/9-x平方)

题目详情

▼优质解答

答案和解析

原式=（x-1)/(x-3)²-1/(x-3)+2x/(x+3)(x-3)
=(x²+2x-3)/(x-3)²(x+3)-(x²-9)/(x-3)²(x+3)+(2x²-6x)/(x-3)²(x+3)
=(2x²-4x+6)/(x-3)²（x+3)

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