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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![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](/uploads/image/z/197900-44-0.jpg?t=1%E3%80%81%E8%AE%A1%E7%AE%97x-y%2B2y%26%23178%3B%2Fx%2By2%E3%80%81%E8%AF%B7%E4%BD%A0%E5%85%88%E5%8C%96%E7%AE%801%2Fa%2B3%2B6%2Fa%26%23178%3B-9%2C%E5%86%8D%E9%80%89%E5%8F%96%E4%B8%80%E4%B8%AA%E4%BD%BF%E5%8E%9F%E5%BC%8F%E6%9C%89%E6%84%8F%E4%B9%89%E4%BB%A3%E5%85%A5%E6%B1%82%E5%80%BC)
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
1、计算x-y+2y²/x+y
2、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
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
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)