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y=(x+2)/(x^2+3x+6) yx^2+3yx+6y=x+2 yx^2+(3y-1)x+(6y-2)=0 這個關於x的方程有解 則判別式大於等於0 所以(3y-1)^2-4y(6y-2)>=0 9y^2-6y+1-24y^2+8y>=0 15y^2-2y-1
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