已知x2-5-1999=0,求代数式(x-2)³-(x-1)²+1除以x-2的值

问题描述:

已知x2-5-1999=0,求代数式(x-2)³-(x-1)²+1除以x-2的值

x-2)(x-2)^2-(x-1)^2+1/(x-2)=(x-2)(x-2)^2-[(x-1)^2-1]/(x-2)=(x-2)(x-2)^2-[(x-1+1)*(x-1-1)]/(x-2)=(x-2)(x-2)^2-[x*(x-2)]/(x-2)=(x-2)[(x-2)^2-x]/(x-2)=(x-2)^2-x=x^2-5x+4因为x^2-5x-1999=0所以x^2-5x=1999所...