(2x+1)平方-2x=1 4x²+2x=02x(2x+1)=0x=0或x=-1/24x平方=x+9 4x²-x+1/4=37/4(2x-1/2)²=37/42x-1/2=√37/2 2x-1/2=-√37/2∴x=1/4+√37/4x=1/4-√37/4x（x-2）+4x-8=0 x(x-2)+4(x-2)=0(x-2)(x+4)...2x平方-5x-3=0(2x+1)(x-3)=0x=-1/2或x=3