已知抛物线y=x²;+(m-1)x+(m+2)与x轴相较于AB两点,且线段AB=2,则m的值为( )
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已知抛物线y=x²;+(m-1)x+(m+2)与x轴相较于AB两点,且线段AB=2,则m的值为( )
已知抛物线y=x²;+(m-1)x+(m+2)与x轴相较于AB两点,且线段AB=2,则m的值为( )
已知抛物线y=x²;+(m-1)x+(m+2)与x轴相较于AB两点,且线段AB=2,则m的值为( )
设A(X1,Y1),B(X2,Y2),依题意得:
x^2+(m-1)x+(m-2)=0
x1+x2=m-1,x1x2=m-2
x1-x2=lm-3l
AB^2=(M-3)^2=2^2=4
解得m=1或m=5
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