x-1/x=3 x2+1/x=

函数f(x)=3x/x2+x+1 (x 函数f(x)=3x/x2+x+1 (x 3/x2 -3x+2-1/x-2=1/x2 -x+4/x2 -2x (x+1)(x2-x+1)+(x-2)(x2+2x+4),其中x=-3/2 x+1/x=3,求x2/x4+x2+1 7/x2+x+1/x2-x=6/x2-1 解方程：1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708解方程：1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708 (x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3 x2-3x+1=0 x2/(x4-x2+1) 解方程：X2--1/8(X2+2X)+X2+2X/3(X2--1)=11 x-1/x=3 x2+1/x= 已知x+1/x=3,求(1)x2+1/x2;(2)(x-1/x)2 x2(3-x)+x(x2-2x)+1,其中x=根号3 1/(x2+x)+1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=4/21x2是x的平方 (1)2/x-3=3/x(2)5x+2/x2+x=3/x+1(3)x/x2-x+2=2x/x+1 5(x2-x)=3(x2+x) 已知x2/x2-2=3,求(1/1-x-1/1 x)/(x/x2-1 x)的值 函数y=x2-3x/x+1求导y=x(x2+1/x+1/x2)求导