x^2+mx+2=mx^2+3x(1-m)x^2+(m-3)x+2=0x=-(m-3)+[(m-3)^2-8(1-m)]^(1/2)/2(1-m)或者x=-(m-3)-[(m-3)^2-8(1-m)]^(1/2)/2(1-m)即x=-(m-3)+[(m^2-6m+9-8+8m)]^(1/2)/2(1-m)=-m+3+[m^2+2m+1]^(1/2)/2(1-m)=-m+3+m+1/(2-2m...