x(7-8x)=3(x-2) 怎么算

x(7-8x)=3(x-2) 怎么算 (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) 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 *-----------------------------------------------*| 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 x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1怎么分解因式 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? (2x-1)(2x+1)+3(x+2)(x-2)=(7x-1)(x+1)怎么算? x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? 秦九韶算法f(x)=2*x^5-3*x^3+7*x+8怎么求? (x+1)/(x+2)+(x+8)/(x+9)解答x+1/x+2+x+8/x+9=x+2/x+3+x+7/x+8 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+8=3x 怎么算? 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! 3x-5x=8x怎么算 4X+2X*(8-X)=26 怎么算 X-40%X+1200=2/3X怎么算