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1.（x^2+x）/(x^2-1) 2.(x^2-9)/(x^2-61.（x^2+x）/(x^2-1)2.(x^2-9)/(x^2-6x+9)3.先化简后求值 x=5.(x^2-8x+16)/(x^2-16)都是分数来的

分类: 作业答案 • 2021-12-19 11:28:32
问题描述：

1.（x^2+x）/(x^2-1) 2.(x^2-9)/(x^2-6
1.（x^2+x）/(x^2-1)
2.(x^2-9)/(x^2-6x+9)
3.先化简后求值 x=5.(x^2-8x+16)/(x^2-16)
都是分数来的

答

1.（x^2+x）/(x^2-1)=x(x+1)/(x-1)(x+1)=x/(x-1)2.(x^2-9)/(x^2-6x+9)=(x-3)(x+3)/(x-3)²=(x+3)/(x-3)3.(x^2-8x+16)/(x^2-16)=(x-4)²/(x+4)(x-4)=(x-4)/(x+4)=(5-4)/(5+1)=1/9

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