尽量快些,x,y是非0的实数,且X2+2xy-3y2=0,求—2Y/X=多少
已知实数x、y满足2x2-7xy+3y2=0,求x:y
已知非零实数x,y满足:x2+xy-2y2=0,求(x2+3y+y2)/(x2+y2)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
设x、y为实数,且x2+xy+y2=3,求x2-xy+y2的最大值和最小值.
已知x2-2xy=3y2且x,y为非零实数 求:(1)2x+y/x-2y (2)2x2-3y2+5xy/x2+xy+y2
已知x、y是实数且满足x2+xy+y2-2=0,设M=x2-xy+y2,则M的取值范围是______.
已知xy不等于0,且3x2-2xy-8y2=0,求x/y的值?
已知2x2+5xy-3y2=0且xy不等于0,求x:y的值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
设x,y为实数,且x2+xy+y2=1,求x2-xy+y2的值的范围