若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=?

来源：学生作业帮助网编辑：作业帮时间：2024/05/02 03:10:09

若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=?
若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=?

若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=?
X2+XY-2Y2=(X-Y)(X+2Y)=0,得X=Y,或X=-2Y,代入,得原式=5/2或-1/5,good luck to you,best wishes to your study

x=y=2,答案=9

x2+xy-2y2=0
(x-y)(x+2y)=0
x-y=0,x+2y=0
x=y或x=-2y
x=y，则原式=(y2+3y2+y2)/(y2+y2)=5y2/2y2=5/2
x=-2y，则原式=(4y2-6y2+y2)/(4y2+y2)=-y2/5y2=-1/5
x2代表x的2次方
2x代表x的2倍

若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=? 若x不等于0是x2+xy-2y2=0,则x2+3xy+y2/x2+y2=急!详细!10分钟哦! 若2x+y=0则(x2+xy+y2)/(2xy-x2)的值若x2+xy-2y2=0,则(x2+3xy-2y2)/(x2-y2)=?x2指X的二次方.我的答案是-2,可正确的答案是5/2或-1/5! 若x2+xy-2y2=0,则(x2+3xy-2y2)/(x2-y2)=?x2指X的二次方.我的答案是-2,可正确的答案是5/2或-1/5! x2+3xy+2y2=0,则x2+y2/xy 若X2+Y2-2X-6Y+10=0 ,求（x2-y2)/xy的值 x的平方+ xy-2y的平方=0,则(X2+3Xy+Y2)/(X2+Y2)=__x的平方+ xy-2y的平方=0,则(X2+3Xy+Y2)/(X2+Y2)=__其中(X2+3Xy+Y2)/(X2+Y2)=__的2为平方若x2+xy-2y2=0,则(x2+3xy+y2)／(x2+y2)=?那假设x或y=o.那X Y就不能删掉啦.怎么办? 解方程组｛3x2-y2=8 {4x2+12xy+9y2=1 {x2+2xy+y2-4=0 x2+xy+y2=4 4x2-9y2=0 x2-2xy+y2-1=0还有{x2+y2=4xy-y2+4=0x2-----x的平方 y2------y的平方还有{2x-3y=12x2-3xy+y2-4x+3y-3=0 已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2= 若3x2-xy+3y2=0 ,则8x2+23y2 的最大值是若|x-y|+（y+3）2=0,则x2+y2-2xy= 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 若x2-xy-2y2=0,Xy不等于0,则X/Y=? 若2分之x=3分之y,求x2-6xy-7y2分之x2-2xy-3y2 若x/y=2,求x2-2xy-3y2/x2-6xy-7y2的值