若x-y=9,xy=7/4,则x+y=?
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|x|/x+y/|y|+xy/|xy|=
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
若x-y=9,xy=7/4,则x+y=?
已知(x+y)^2=9,x^2+y^2=7,则xy=?已知(x+y)^2=9,x^2+y^2=7,则xy=?已知(x+y)^2=4,(x-y)^2=3,则x^2+y^2=?若x^2+y^2=3,xy=1,则x-y=?
若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=?
若x.y>0,9x+y=xy,则x+y的最小值为?
若x.y>0,9x+y=xy,则x+y的最小值为?
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