()²+2分之3xy+y²=( )²
3xy+3y²分之x²+xy=3y分之( )
(1)-2分之1xy(3y²-2xy+3x²y)
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1
已知2x²-5xy-3y²=0(xy≠0),则y分之x+x分之y的值是?
计算:(xy-x²)乘 x-y分之xy
已知y分之x=3,求x²-xy+y²分之x²+2xy-3y²
x+2y=0(x≠0),求分式x²-xy分之2xy+y²
已知2x²-xy-2y²=0,(xy不等于0)求x分之y
计算:2x+2y分之3y + x²+xy分之2xy
2x+2y分之3y 加 x²+xy分之2xy
已知x²+y²-2x+4y+5=0,求(x²-xy)分之y减去(xy-x²)分之