已知xy>0,x≠y,试比较loga(3x²+4xy+y²)与loga(2x²+6xy)(
已知xy>0,x≠y,试比较loga(3x²+4xy+y²)与loga(2x²+6xy)(
已知loga^(x的平方+4)+loga^(1+y的平方)=loga^5+loga^(2xy-1)求log4^y/x
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知a>0且a不等于1,x>0,y>0,试比较loga(1/x)*loga(1/y)与与loga根号(y/x)*loga
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
x/xy-y²与y/x²-xy 通分
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
计算:(xy-x²)×x-y/xy
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
整式的乘法与因式分解已知,x²-3xy+2y²=0(xy≠0),则x/y+y/x=___(由于不好打
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)