2x*2-3xy+(-y*2)-2x*2-(-5xy)+2y*2 *表示乘方,
在实数范围内分解因式2x*2-3xy-y*2.(*表示乘方)
计算:3xy[2xy-x(y-2)+x]
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
(xy-x^2)乘以(xy)/(x-y)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
(3X平方-5Y)+[-3XY-2(X平方-XY)+Y平方]