1/(x+1)+1/(x+2)=1/x+1/(x+3)

x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2) 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002 x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 x/x平方-x+2=2x/x+1 1+x+x^2+x^3+.+x^99+x^100 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| f(x-1)=x^2-2x+3(x (x+3)×(x+2)×(x+1)×x=3024 f(x)=(x-1)(x-2).(x-3)求导 (x+2)(x-3)(x-6)(x-1)=0