（2m² -5m+2）x-（m² -4）y+5=0的斜率为1,则m^2-4不等于0,且(m^2-4)y=(2m^2-5m+2)x+5y=[(2m^2-5m+2)/(m^2-4)]x+5/(m^2-4)(2m^2-5m+2)/(m^2-4)=12m^2-5m+2=m^2-4m^2-5m+6=0(m-2)(m-3)=0则m=2,或者,m=3,因为...