①ac分之2bc ②xy²分之(x+y)y ③(x+y)²分之x²+xy ④(x-y)
计算:(xy-x²)乘 x-y分之xy
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
(xy-x²)·x²分之x-y
3xy+3y²分之x²+xy=3y分之( )
计算:1、(xy分之x²-y²)×(x-y分之x)-(y分之x);
(1)-2分之1xy(3y²-2xy+3x²y)
(x分之x-y)-(y分之x+y)+(2xy分之x的平方-y的平方)
小明在做化简求值题:(xy-x²)÷xy分之x²-2xy+y²乘x²分之x-y
已知x²+y²-2x+4y+5=0,求(x²-xy)分之y减去(xy-x²)分之
(√xy -xy分之x+√xy)除以√xy -y分之x-y(x>0,y.0)
x+2y=0(x≠0),求分式x²-xy分之2xy+y²
x²+y²+2xy分之x²-4y² ÷x²+xy分之2y+x