x^2-4x / x^2-8x+16 ,其中 x=5 .先化简 再求值

*-----------------------------------------------*| 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 || 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 (x^2 + 4x)(x^2 + 4x+8)+16 (x^2-4x)(x^2-4x+8)+16 x^2-8x+16分之x^2-4x （x^2-4x）/x^2-8x+16 因式分解：(X+2)(X+4)(X+6)(X+8)+16 计算(x+/1x)(x^2+1/x^2)(x^4+1/x^4)(x^8+1/x^8)(x^16+1/x^16)(x^2-1) (x+1/x)(x^2+1/x^2)(x^4+1/x^4)(x^8+1/x^8)(x^16+1/x^16)(x^2-1) (x+x^-1)(x^2+x^-2)(x^4+x^-4)(x^8+x^-8)(x^16+x^-16)(x^2-1)=? x(x+2)(x-2)-4x^2+8x 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^2-8x+16)/(4-x^2)/(16-x^2)/(4+4x+x^2) x/x-2=x²-8x+16/x²²-4x+4 (x+1)(x^2+1)(x^4+1)(x^8+1)(x^16+1)(x-1) x=1-x/2+x/4-x/8+x/16-x/32 X,2X,4X,8X,16X,32X,.第N个单项式为什么 分解因式：x*x*x*x+2*x*x*x-9*x*x-2x+8