求：1/(x^2+11x-8)+1/(x^2+2x-8)+1/(x^2-13x-8)=0 急

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求：1/(x^2+11x-8)+1/(x^2+2x-8)+1/(x^2-13x-8)=0急求：1/(x^2+11x-8)+1/(x^2+2x-8)+1/(x^2-13x-8)=0急求：1/(x^2+1

求：1/(x^2+11x-8)+1/(x^2+2x-8)+1/(x^2-13x-8)=0 急
求：1/(x^2+11x-8)+1/(x^2+2x-8)+1/(x^2-13x-8)=0 急

求：1/(x^2+11x-8)+1/(x^2+2x-8)+1/(x^2-13x-8)=0 急
1/(x^2+11x-8)+1/(x^2+2x-8)+1/(x^2-13x-8)=0
(x^2-8+2x)(x^2-8-13x)+(x^2-8+11x)(x^2-8-13x)+(x^2-8+11x)(x^2-8+2x)=0
(x^2-8)^2-11x(x^2-8)-26x^2+(x^2-8)^2-2x(x^2-8)-143x^2+(x^2-8)^2+13x(x^2-8)+22x^2=0
3(x^2-8)^2-147x^2=0
(x^2-8)^2-49x^2=0
(x^2+7x-8)(x^2-7x-8)=0
(x+8)(x-1)(x-8)(x+1)=0
x1=1,x2=-1,x3=8,x4=-8

已知x*x+x-1=0 求x*x*x-2x+11=? 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 |x^2-4x+3|+|x+1|>8 求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 || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 求x^2-3x/x^2-6x+9*x^2-11x+30/x^2-5x-1 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, 3^x=2^x,求x.5^(x-1)·10^3x=8^x求x 线性代数求行列式 |1 2 x 1| |x 1 x x| |x x 1 x| |x x x 1|线性代数求行列式|1 2 x 1||x 1 x x| |x x 1 x||x x x 1| 1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做已知x^2+x-1=0,求x^8-7x^4+11 已知x^2+x-1=0,求x^8-7x^4+11的值 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少已知x*x+x-1=0求x*x*x-2x+2010的值 x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x