(X-1)²+|y+2|=0,求多项式-3X²Y-2XY²+2YX²+3XY
3xy+xy+2x²y+yx²+3x²y等于多少
已知x+y=2,xy=-3,求多项式1/2(x²+y²)-xy的值
.先化简,后计算.[2x(x²y-xy²)+xy(xy-x²)]/x²yx=20
下列多项式:(1)x²+xy-y²;(2)-x²+2xy-y²;(3)xy+x&
(x³-2xy²)dy+(2y³-3yx²)dx=0求通解
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知x+y=3 xy=2 则多项式-x²y-xy²的值是多少求计算方法
已知y=3xy+x,求代数式2x+3xy−2yx−2xy−y
求6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x
x²-3xy-3x²y²+2yx²-y²x 合并同类项
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
已知x2+y2=9,xy=-3,求多项式5x²-3xy-5y²-11xy-8x²+2y