- 大鱼炖火锅
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= -(x+3)/(x-3)+(x+3)(x-3)/(x+3)^2=-(x+3)(x-3)+(x-3)/(x+3)=[-(x+3)^2+(x-3)^2]/[(x-3)(x+3)]
=-12x/(x^2-9)
- 豆豆staR
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原式=-12x/(x^2-9)
- 北有云溪
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= -(x+3)/(x-3)+[(x+3)(x-3)]/(x+3)²=-(x+3)/(x-3)+(x-3)/(x+3)=[-(x+3)²+(x-3)²]/[(x-3)(x+3)]
=-12x/(x²-9)
- 可可
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化简?
-12x/(x^2-9)