2x-(x+1)^2=3x^2-5怎么算求过程

(x^10-x^5+1)/(x^2+x+1) 怎么算?(x^10-x^5+1)/(x^2+x+1)=（x^8-x^7+x^5-x^4+x^3-x+1) (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? 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+2)(x+3)-(x+6)(x-1) 怎么算? *-----------------------------------------------*| 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 || 7x-3(2/3x+1/5x)-(x+2/5x)+2x,=5x怎么求出 x-1+x-2+x-3+x-4+x-5+x-6+x-7=77怎么解速度! 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 x(x-2)+m(1-x)=3怎么算 (3)/(x)+(5)/(2x-1)=(x+27)/2x^2-x怎么解啊! x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1怎么分解因式 2(x-1)(x+5)-3(x-2)-4x=2x的平方+7方程题怎么算? (2x-1)(2x+1)+3(x+2)(x-2)=(7x-1)(x+1)怎么算? 方程x+1/x^2-x 减去1/3x=x+5/3x-3怎么解? (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3) 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) x(x-2)-2x(x+1)-3x(x-5) 其中x=负½