1、计算x-y+2y²/x+y

学习时间:2026-08-11 07:27:52 阅读：3116

1、计算x-y+2y²/x+y2、请你先化简1/a+3+6/a²-9,再选取一个使原式有意义代入求值

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2026-08-11 07:27:52

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1、[(x-y)(x+y)+2y²]/(x+y)=(x²-y²+2y²)/(x+y)=(x²+y²)/(x+y)2、原式=(a-3)/(a+3)(a-3)+6/(a+3)(a-3)=(a-3+6)/(a+3)(a-3)=1/(a-3) 再答：请采纳