x2+2xy-y2=7,则x2+y2的最小值为
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x2+2xy-y2=7,则x2+y2的最小值为
若x2+2xy-y2=7则x2+y2的最小值为
若X2+xy-2y2=0,则(x2+3xy+y2)/x2+y2=?
(x2-2xy+y2)-(x2+2xy+y2)=什么
化成最简分式:6x2-7xy-3y2分之2x2+xy-6y2
如果x2+y2=5,那么代数式(3x2-2xy-y2)-(x2-2xy-3y2)的值为
已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2=
已知x2+y2=7,xy=-2,求5x2—3xy—4y2—11xy—7x2+2y2的值
已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值.
若3x2-4xy+y2=-3,2x2+3xy-2y2=8,求5x2-18xy+7y2的值.
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
x2+3xy+2y2=0,则x2+y2/xy
已知X/Y=2/7, 求X2-3XY+2Y2/2X2-3XY+7Y2的值
已知x/y=2/7,求分式(x2-3xy+2y2)/(x2-2xy+y2)的值
已知x/y=2/7,求分式x2-3xy+2y2/x2-2xy+y2的值
若x/y=2,求x2-2xy-3y2/x2-6xy-7y2的值
已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2=
若2x+y=0则(x2+xy+y2)/(2xy-x2)的值