已知:x+y=6,xy=-3,则 xyy+yxx=
已知:x+y=6,xy=-3,则 xyy+yxx=
已知3x2+xy-2y2=0,求(x+yx-y+4xyy
xyy-zz=yx 问x.y.z分别是多少
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
化简(x-yx2-2xy+y2-xy+y2x2-y2)•xyy-1= ___ .
已知x+y=6,xy=-3,则x^2y+xy^2=?
已知x+y=6,xy=-3,则x^2y+xy^2=
0=xy^2 求导等于y^2+2xyy'y'是怎么来的?
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.