如题

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如题如题如题原式=x²/(x-5)-25/(x-5)=(x²-25)/(x-5)=(x+5)(x-5)/(x-5)=x+5望采纳你这是要通分吗?原式=x^2/(x-5)-25/(x

如题

如题

如题
原式
=x²/(x-5)-25/(x-5)
=(x²-25)/(x-5)
=(x+5)(x-5)/(x-5)
=x+5




望采纳

你这是要通分吗?

原式=x^2/(x-5)-25/(x-5)
=(x^2-25)/(x-5)
=(x-5)(x+5)/(x-5)
=x+5.

x²-25/x-5
x-5
你明白了么? 把+号变成减号进行运算

(x+5)/(x-5)

x^2/(x-5)+25/(5-x)
=x^2/(x-5)-25/(5-x)
=( x^2-25)/(x-5)
=(x+5)(x-5)/(x-5)
=x+5 x不等于5

5-x=-(x-5)
∴原式=x²/(x-5)-25/(x-5)
=(x²-25)/(x-5)
=(x+5)(x-5)/(x-5)
=x+5
望采纳 谢谢