若4x-3y=0且x≠0,y≠0,则4x−5y4x+5y的值为( )
若4x-3y=0且x≠0,y≠0,则4x−5y4x+5y的值为( )
min=7x+5x4x+3y-20≤0x-3y-2≤0x,y≥0min=7x+5y4x+3y-20≤0x-3y-2≤0y
若(x-4y)(x+3y)=0 且xy>0 则分式x+3y/2x-y的值为
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值
设实数x,y满足不等式组{x+2y-5>0 2x+y-7>0 x>=0 y>=0} ,且x,y为整数,则3x+4y的最小
若5x-6y=0,且xy≠0,则10x-4y/10x-3y的值等于
若4x-3y=0则4x-5y除4x-5y的值为
若4x-5y=0且y≠0,则12x−5y12x+5y的值( )
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*
若2x-3y=0,且y≠0,则6x-7y/6x+7y的值为______________
已知,xyz≠0,且2x+3y=3x-8y=5z,则(x+y)/(x-y)的值.
已知xyz≠0,且2x+3y=3x-8y=5z,则x+y/x-y的值是