计算：x2+x+1-x2/x-1

题目详情

计算：x2+x+1-x2/x-1

▼优质解答

答案和解析

=(x-1)(x^2+x+1)/(x-1)-x^2/(x-1)
=(x^3-1-x^2)/(x-1)
={x^2(x-1)-1}/(x-1)
=x^2-1/(x-1)

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