①(9x²y-6xy²)÷3xy ②(3x²y-xy²+2分之1xy)÷(-2分
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y&
计算:2x+2y分之3y + x²+xy分之2xy
2x+2y分之3y 加 x²+xy分之2xy
(1)-2分之1xy(3y²-2xy+3x²y)
合并同类项:(2xy²+3xy²)-(6x²y-3xy²)
x²-2xy+y²分之x²+2xy-3y³如何因式分解
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
x²+y²+2xy分之x²-4y² ÷x²+xy分之2y+x
(x²+2xy+y²分之x²-4y²)÷(x²+xy分之x+2y)