(-2x)*(x2-5x+6)-4x(2x2-3x+1)

计算:x2-5x+6/x2-4x+3 + x2-4x+3/x2-2x+1 + x2-3x-4/1-x2 (-2x)*(x2-5x+6)-4x(2x2-3x+1) 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 约分x2+x-2/x2-x-6 (x2-x)2+6(x2-x)+9 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 解分式方程:2/x2+5x+6 + 3/x2+x-6=4/x2-4 (x-2)*((x2+2x+4)/(x3-8)-5/(x2+x-6)) 化简 （-x2+5+4x)+(5x-4+2x2) (-x2+5+4x)+(5x-4+2x2) (x2+2x-3)(x2+2x+4)+6因式分解 因式分解 (x2-5x+4)(x2-x-2)-72 (x-x2)(x2+x-6)分之(x2+3x)(x2-3x+2) 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 因式分解 (x2-2x-x)(x2-2x+4)+9 5x2—[x2+(4x—x2)—2(x2—3x)]