x,y满足x2+2xy+3y2=2,x+2y的范围

x,y满足x2+2xy+3y2=2,x+2y的范围 已知实数x、y满足2x2-7xy+3y2=0,求x：y 已知x.y满足X2-y2=2xy.则x-y/x+y=?x. 整数x,y满足x2-y2=2xy,求x-y/x+y的值 正整数x,y满足x2-y2=2xy,求x-y/x+y的值 已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值 已知非零实数x,y满足:x2+xy-2y2=0,求(x2+3y+y2)/(x2+y2)的值 计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2） 已知xy满足x2+y2-6x+2y+10=0,求立方根号x2-y2的值 1.已知正数x,y满足x2-y2=2xy,求(x-y)/(x+y)的值2.若x2+xy-2y2=0则(x2+3xy-2y2)/x2-2y2)=_________3.先化简,后求值：(3-x)/(x-2)除以（x+2-2/(x-2)）,其中x=2√2  如果2/x=3/y,那么x2-2xy+3y2/7x2-y2? 正数xy满足x2-y2=2xy,求x+y分之x-y的值2是平方, 已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值 已知实数x,y满足(x2)+(y2)-xy+2x-y+1=0,求x,y的值 已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值 正数X,Y满足x2-y2=2xy,求（x-y)除以（x+y)的值 x2-2xy-3y2=0,其中x,y均不为零,求（y-x）/x2-xy/2x-y-y2/xy-x 若实数XY满足X2+Y2=1,则X-2Y的最大值为