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解二次分式方程，1/(x²+3x+2)+1/(x²+5x+6)=1/x+4,巧妙分解因式
去分母巧解二次分式方式方程，1/(x²+3x+2)+1/(x²+5x+6)=1/x+4。
初中数学分式集合23/122
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