已知x+y=8,xy=12求x^2+xy
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=?
1.已知x--xy=8,xy--y=--9,求x+y--2xy的值
已知x²-7xy+12y²=0求x²-xy+y²/2xy的值
整式乘法公式已知X+Y=8,XY=12,求:(1)X方Y+XY方(2)X方-XY+Y方
已知x+y=12,xy=9,求(x+3xy+y)/(xy+xy)的值
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知xy^2=-2 求-xy(x^2y^5-xy^3-y)
已知:x-xy=40,xy-y=-20,求代数式x-y和x+y-2xy的值.
已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.