若|x+y-7|+(xy-3)²=0,则4x²+4y²的值为( )填空
已知y=(x²-3xy-2y²)/2y,则x:y的值为
若(x-4y)(x+3y)=0 且xy>0 则分式x+3y/2x-y的值为
若|2x+y-1|+(x-2y)²=0,则x²+xy+y²的值为?
已知x²-3xy-4y²=0(xy≠0),则(y/x)+(x/y)的值是
若xy³=-3,则-xy【x²y五次方-xy³-y】的值为
若x+y=8,xy=7,则代数式3xy-x-y+4的值为___.
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
若x,y满足等式|x+2|+(y-3)^2=0,则(5x^2 y+5xy-7x)-(4x^2y+5xy-7x)的值为?
已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为( )
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知有理数x,y满足xy=4,x+y=7,则x²y+xy²=()?