(1)(x-y/xˇ2-2xy+yˇ2-xy+yˇ2/xˇ2-yˇ2)*xy/y-1(2)m-⒖/mˇ2-9-2/m-3
已知M=3x²-2xy+y²,N=2x²+xy-3y²,求:(1)M-N; (2
已知M-(2x^2-3xy+xy^2)(-xy)=(2x^2 y+xy^2)(x-2y),求多项式M
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
(x+y-2xy)(x+y-2)+(1-xy)²
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
已知M-(2x的平方-3xy+xy的平方)(-xy)=(2x的平方y+xy的平方)(x-2y)
(xy-x^2)乘以(xy)/(x-y)
分解因式:(X+Y)*(X+Y+2XY)+(XY+1)*(XY-1)
已知实数x,y满足xˇ2+yˇ2=1则(1-xy)(1+xy)的最大值
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
(1)-m^2+2m-1/1-m^2 (2)y^2-2xy+x^2/x^2-y^2 (3)(x-y)^2(a+b)/(y
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2