若对x,y∈【1,2】,xy=2,总有不等式2-x≥a/(4-y)成立,则实数a的取值范围是
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若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思,是3x-2xy-3y/x-2xy-y
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
对正数x,y,若x+2y+xy=30,则xy的取值范围是
若x^y-2xy+y+x^2-2x=1983,求满足条件的整数对(x,y)....
若x-y=1,xy=5,则x^2y-xy^2=
若xy满足x²+2x+y-2√y-1=-1,求xy,
若x,y满足x^+2y^-2xy+1=0,求xy的值
1若x+2y=0 ,xy不等于0,求分式 x^2+2xy / xy+y^2
已知x+y=1,xy=-2,则x²y+xy²-2xy
1-2/x+y=xy,4y+6x=xy.求xy的解?
f(x^2-y^2,x-y)=x+y+x^2-xy,求f'(x,y)对y求导
若1/X-1/Y=3,则2X+XY-2Y/X-2XY-Y=?
若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?
若(2x-14xy-2y)除以(x-2xy-y)=4,则1/x-1/y=
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
若1/x-1/y=3,求(2x+3xy-2y)/(x-2xy-y)的值
若1/x -1/y =3,求(2x+3xy-2y)/(x-y-2xy)