(4x²-4x+2分之x)*(2x²-x)= (4x²-7x/2)*(2x²-x)=(x/2)(8x-7)(x)(2x-1)=x^2(8x-7)(2x-1)/2,x=1,x^2(8x-7)(2x-1)/2=1*(8-7)*(2-1)/2=1/2
