如果是因式分解,那么:3(x+2)²-(2x-1)(2x+1)=3(x²+4x+4)-(4x²-1)=3x²+12x+12-4x²+1=-x²+12x+13=-(x²-12x-13)=-(x+1)(x-13)如果是化简,那么:3(x+2)²-(2x-1)(2x+1)=3(x²+4x+4)-(4x²-1)=3x²+12x+12-4x²+1=-x²+12x+13