( )+x^2-xy+2y^2=2x^2+xy+3y^23x^2+xy-7y^2-( )=x^2-2xy+y^2
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( )+x^2-xy+2y^2=2x^2+xy+3y^23x^2+xy-7y^2-( )=x^2-2xy+y^2
( )+x^2-xy+2y^2=2x^2+xy+3y^2
3x^2+xy-7y^2-( )=x^2-2xy+y^2
( )+x^2-xy+2y^2=2x^2+xy+3y^23x^2+xy-7y^2-( )=x^2-2xy+y^2
()=2x^2+xy+3y^2-x^2+xy-2y^2=x^2+2xy+y^2
()=3x^2+xy-7y^2-x^2+2xy-y^2 =2x^2+3xy-8y^2
(xy-x²)÷(x²-2xy+y²/xy)×(x-y/x²)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
(x^2+xy/x-y)/(xy/x-y)计算
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
已知x-xy=10,xy-y=2,则x-y=( ),-2xy+x+y=( ).
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
已知x-xy=20 xy-y=12,则x-y=( ),x+y-2xy=( ).
{x,xy,lg(xy)}={0,|x|,y} 则log8(X^2+Y^2)
求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
( )+x^2-xy+2y^2=2x^2+xy+3y^23x^2+xy-7y^2-( )=x^2-2xy+y^2
计算:3xy[2xy-x(y-2)+x]
2xy+x+y=?(因式分解)
(xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以(xy)/(x-y)= -x(x-y)乘以(xy)/(x-y)= -x^2y这样做对吗?
(-3x^y+2xy)-( )=4x^+xy
(XY-X^2)除以X-Y/XY=?
(-x-y)(x^2+xy+y^2)
化简x^-y^/x^-2xy+y^