左边＝（2m）^2(-4m+3)＝4m^2(-4m+3)＝-16m^3+12m^2右边＝m^2(-4m+2)＝-4m^3+2m^2左边－右边＝（-16m^3+12m^2）－(-4m^3+2m^2)＝-16m^3+12m^2+4m^3-2m^2＝-12m^3+10m^2＝2m^2(5-6m)因为2m^2为非负数,1〉当m＝0或5-6m...