(8/9xy^2-4/3x^2y)*(9/4x^2y^2)+3x^2y^2*x^2y

已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=? 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， 已知x-xy=8,xy-y=-9,求x+y-2xy的值 (1).x^2-8xy+7y^2(2).4x^2+9xy+2y^2(3).2x^2+7xy+3y^2(4).6x^2+xy-2y^2 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) [ 2x-6y][8-9xy]÷xy等于? (9x^2y-6xy^2)/3xy 因式分解3x2+xy-y2+x+9y-43X^2+XY-Y^2+X+9Y-4 已知X+Y=3,XY=-1,求2(X-Y)^4-9(X-Y)^2+12XY 化简:-x(2)-(2xy) *9x(2)-9xy(3)+12x(4)y(2)/(3xy)谢谢! 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 因式分解30题(要过程)am+an+bm+bn x^2+5y-xy-5x x2+xy+2xz+x (a+b)x-(b+a)y -12x(x-y)-(y-x)x^2 2x^2+4x+2 x(x+z)-y(y+z) 2(x^2-3ab)+x(4a-3b) 4x^2+12xy+9y^2-25 x^4-16 16x^4-1 x^2+9x+8 x^2-10xy+24y^2 2x^2+15xy-8y^2 3x^2-6xy+3y^2 24x^2+22x-21 -x^2+4xy- 9-x^2-y^2+4xy 9-x^2-y^2+4xy, 已知2x-3根号xy-2y=0(x>0),求x^2+4xy-16y^2/x^2+xy-9y^2 已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为 已知2x^2+xy=10,3y^2+2xy=6,求4x^2+8xy+9y^2的值