4x+2m=3x+1 x=1-2m3x+2m=6x+1 3x=(2m-1)/3两方程解相同,1-2m=(2m-1)/3(4/3)(2m-1)=0 2m-1=0 m=1/2(-2m)^2007-(m-3/2)^2008=[(-2)(1/2)]^2007-(1/2-3/2)^2008=(-1)^2007-(-1)^2008=-1-1=-2