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化简 x²+2x+1/x²+3x+2 - x²-3x+2/4-x² + 9-3x-2x²/x²-x-6
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=(x+1)²/(x+1)(x+2)-(x-1)(x-2)/(2-x)(x+2)-(x-3)(2x+3)/(x+2)(x-3)=(x+1)/(x+2)+(x-1)/(x+2)-(2x+3)/(x+2)=(x+1+x-1-2x-3)/(x+2)=-3/(x+2)
后面辩握一个式子符号有态嫌问题。应帆灶手该是如上
后面辩握一个式子符号有态嫌问题。应帆灶手该是如上
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