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若x2+mx+3=(x+3)(x+1),则方程mx2+3mx+8=0的两个根是(...
若x2+mx+3=(x+3)(x+1),则方程mx2+3mx+8=0的两个根是( )
A.x1=1,x2=2
B.x1=-1,x2=-2;
C.x1=1,x2=-2
D.x1=-1,x2=2
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