1.若X^2(X+1)+y(xy+y)=(x+1)·A,则A=____?2.已知x-y=1,xy=2,则x^3-2x^2y^2+xy^3的值是_____?3.169(a+b)^2-121(a-b)^24.(x^2-2x)^2-14(x^2-2x)-155.(x+2)(x+4)+1就这些了,都要分析步骤

若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若x^2+xy+y=14,y^2+xy+x=28,求x+y 若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x= 化简求值1.x^2+2xy+y^2/x^2-y^2除以x^2+xy/xy-y^2X=1Y=-2011 若x-y=1,xy=5,则x^2y-xy^2＝ 若xy满足x²+2x+y-2√y-1=-1,求xy, 若x,y满足x^+2y^-2xy+1=0,求xy的值 |x|/x+y/|y|+xy/|xy|= 若1/X-1/Y=3,则2X+XY-2Y/X-2XY-Y=? 若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=? 若(2x-14xy-2y)除以(x-2xy-y)=4,则1/x-1/y= 若1/x-1/y=1/3,求(2x+3xy-2y)/(x-3xy-y) 若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y) 若1/x-1/y=3,求(2x+3xy-2y)/(x-2xy-y)的值 若1/x -1/y =3,求(2x+3xy-2y)/(x-y-2xy) 若1/X—1/Y=2,求3X-2XY-3Y/X-2XY-Y