若x+y=-4,xy=-12,求x+1分之y+1再加y+1分之x+1的值

若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 1-2/x+y=xy,4y+6x=xy.求xy的解? 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 已知X+Y=3,XY=-1,求2(X-Y)^4-9(X-Y)^2+12XY 若1/x+1/y=5,求3x+4xy+3y/x+3xy+y的值 若1/X-1/Y=3,求5X+2XY-5Y/X-4XY-Y 若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值 若(1/x )-(1/y)=3,求(3x+4xy-3y)/(x-2xy-y)的值. 若x+y=4,x^3+y^3=(x+y)(x^2-xy+y^2)z,求x^3+12xy+y^3的值. 求一道因式分解题步骤和答案、加急~(xy+1)(x+1)(y+1)+xy=(xy+1)(xy+x+y+1)+xy x+y=4,xy=－12,求x^+y^,x^-xy+y^实际求：x平方＋y平方和x平方－xy＋y平方 若（x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值 x-y=1,xy=2.求：(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 .已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若x²-4xy+5y²-2y+1=0,求x,y 1/x-1/y=x,求5y+xy-5y/y-xy-x=? 已知x y=1,xy=-3,求2xy-4x 4(y-2(xy-x)) 几道因式分解题4X的四次方+1X的三次方-3X+2(X+Y-2XY)(X+Y-2)+(XY-1)²(X+1)(X+2)(X+3)(x+6)+X²X-2Y=8/20072X+Y=2007/3 不解方程组,求9X²-15XY-6Y²的值