x^2-2x-1=0 ==> x^2=2x+1和 x的值 这个会算吧
x^4-x^3-3x^2-x+5
=(2x+1)^2-(2x+1)*x -3*(2x+1)+5
=4x^2+4x+1-2x^2-x-6x-3+5
=2*(2x+1)-3x+3
=x+5
x^2-2x-1=0 ==> x^2=2x+1和 x的值 这个会算吧
x^4-x^3-3x^2-x+5
=(2x+1)^2-(2x+1)*x -3*(2x+1)+5
=4x^2+4x+1-2x^2-x-6x-3+5
=2*(2x+1)-3x+3
=x+5