化简,如下,急
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 15:33:43
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化简,如下,急
化简,如下,急
化简,如下,急
(x-3)/(x^2-1)-2/(1+x)
=(x-3)/(x^2-1)-2(x-1)/(x^2-1)
=((x-3)-2(x-1))/(x^2-1)
=(-x-1)/(x^2-1)
=-(x+1)/(x^2-1)
=-1/(x-1)
=1/(1-x)
﹙x-3﹚/﹙x²-1﹚-2/﹙x+1﹚
=﹙x-3﹚/﹙x²-1﹚-2﹙x-1﹚/﹙x²-1﹚
=﹙x-3-2x+2﹚/﹙x²-1﹚
=﹣﹙x+1﹚/﹙x²-1﹚
=﹣1/﹙x-1﹚
=1/﹙1-x﹚.
=x-3/(x+1)(x-1)-2(x-1)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=-1/x-1
=1/1-x
没有用到二次项,应该是最简单的,希望你能看懂。