化简:(5x+2x2)+(1–5x–3x2)

化简:(5x+2x2)+(1–5x–3x2) 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 计算:x2-5x+6/x2-4x+3 + x2-4x+3/x2-2x+1 + x2-3x-4/1-x2 解方程：1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708解方程：1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708 (x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3 (-2x)*(x2-5x+6)-4x(2x2-3x+1) (-x 2x2-3 x 1) 2(x 2x -5)-(4x2-3x 5 x 1)的计算 x2-4x+3分之x2-5x+6+s2-2x+1分之x2-4x+3+1-x2分之x2-3x-4的过程 1/(x2+x)+1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=4/21x2是x的平方 (1)2/x-3=3/x(2)5x+2/x2+x=3/x+1(3)x/x2-x+2=2x/x+1 5(x2-x)=3(x2+x) (x+1)2-2(x2-1)+(x-1)² (x2-3x+1)(x2-3x-3)-5 因式分解 -2x2-5x+-2x2-5x+3 6x+2x2次方一3x+x2次方+1,其中x=一5 不等式:(x2+3x+3)/(x2+2x+5) 化简：x2-3x+5 化简1/x2-3x+2 +1/x2-x +1/x2+x +1/x2+3x+2 2x2-5x+3