若x/x^2-x+1=6/7,求x^4+x^2+1/x^2

(x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几? 已知x=2π+1求 |x-1|+|x-2|+|x-3|+|x-4|+|x-5|+|x-6|+|x-7|+|x-8|+|x-9|+|x-10| 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^+x^6+x^7+x^8的值 已知x=2π+1.求(X-1)+(X-2)+(X-3)+(X-4)+(X-5)+(X-6)+(X-7)+(X-8)+(X-9)+(X-10) 如果1+x+x^2+x^3=0,求x+x^2+X^3+x^4+x^5+x^6+x^7+x^8的值, 求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 若x/x^2-x+1=6/7,求x^4+x^2+1/x^2 若x*x+x+1+0,求x^7+2x^6+x^5+x^4+x^3+x*x+1的值 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少 若3x^2-x=1,求6x^3+7x-5x+2009 7x-6+5x+1=4x+3-2x求x是多少 x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? 1.(x*2-3x+3)/(x*2-3x+2)-(x*2-5x+7)/(x*2-5x+6)-1/(x*2-4x+3)2.1/x(x+1)+2/(x+1)(x+3)+3/(x+3)(x+6) 3.已知：x*2-3x+1=0,求x*2+1/x*2. 若 x^2-3x-1=0 求 2x^4-7x^3+5x^2-x+4 x=1/6x+1/12x+1/7x+5+1/2x+4 求x是多少? x=1/6x+1/10x+1/7x+5+1/2x+4 求x 若4*x*x-2*x+5=7,求式子2*x*x-x+1的值