（2X-1)(2X+1)(4X+1)怎么算?

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 *-----------------------------------------------*| 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 || (x-1)(x-2)(x-3)(x-4)-(x^2-5x)^2-10(x^2-5x)怎么算? x-1/x-2-x-3/x-4=x-2/x-3-x-4/x-5怎么做? x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1怎么分解因式 1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11+x^12=97.8 好多年没有用过过数学公式了 想不起来怎么算了 想知道 X值是多少 (X-3)/(X^2-4)*(X^2-4X+4)/(x^2-x-6)-1/(x+2)怎么算?(X-3)/(X^2-4)*(X^2-4X+4)/(x^2-x-6)-1/(x+2),怎么算? 1/(x+1)(x+2)+1/(x+3)(x+4)+1/(x+5)(x+6)+1/(x+7)(x+8)+1/(x+9)(x+10)怎么解 (x+2)(x+3)-(x+6)(x-1) 怎么算? x*x+2*x+1=36,x怎么解, (x-1)(x+2)(x+3)(x+6)怎么做? x-1+x-2+x-3+x-4+x-5+x-6+x-7=77怎么解速度! x^4-1-4x^2-4x怎么做 x^4-1-4x^2-4x怎么做? （2X+3)(2X-3)-4X(X-1)+(X-2)²怎么运算, 6x(X-1)+x-1=4x+x=2怎么解 x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 lim (x->1) (x^2-6x+8)/(x^2-5x+4) 怎么算?