x+xy+y=1,x^2+x^2*y^2+x^2=17
x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x
(1)x(x-1)-(x^2-y)=-2,求{(x^2)+(y^2)}/2-xy
-3xy(x^2-2x-1)+(2x-3y)(3x-4y)=?
x(x-1)-(x平方-y)=-3,求x平方+y平方-2xy
(xy-x^2)乘以(xy)/(x-y)
x^2+xy+x=36,y^2+xy+y=20,求x+y.
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值.
已知:xy+x=-1,xy-y=-2,求多项式-x-[2y-2(xy+x)的平方+3x]+2[x+(xy-y)的平方]的