x+y=a,xy=b,xy^2+yx^2=?
已知x-y=4xy,则2x+3xy-2yx-2xy-y
xy+yx=10x,y是多少
.先化简,后计算.[2x(x²y-xy²)+xy(xy-x²)]/x²yx=20
已知y=3xy+x,求代数式2x+3xy−2yx−2xy−y
已知x+y=2,xy=-5,则yx+xy
XY+Y=YX 问:XY是多少
实数x、y、z满足x=6-3yx+3y-2xy+2z
已知:y=1−8x+8x−1+12,则代数式xy+yx+2-xy+yx−2的值为( )
xy*yx=2268
求方程(y^2+xy^2)dx+(x^2-yx^2)dy=0的通解
已知x2+y2-2x-4y+5=0,分式yx−xy
已知3x2+xy-2y2=0,求(x+yx-y+4xyy