已知x2-5x-2000=0,求代数式(x-2)的立方-(x-1)2+1除以x-2的值
问题描述:
已知x2-5x-2000=0,求代数式(x-2)的立方-(x-1)2+1除以x-2的值
答
((x-2)^3-(x-1)^2+1)/(x-2)
=(x-2)^2-(x^2-2x+1-1)/(x-2)
=x^2-4x+4-(x^2-2x)/(x-2)
=x^2-4x+4-x
=x^2-5x+4
=2000+4=2004