绝对值xy积分在x^2 y^2答案-搜答案-大师作文网

已知x-1的绝对值+y-2的绝对值=0x-1=0、y-2=0x=1、y=22x^2-[x^2-(2xy-y^2)+2xy]=2-[1-(4-4)+4]=-3

如图

┃2x-6┃+┃y-11┃=0∴2x-6=0y-11=0x=3y=11∴xy=3*11=33

当x=2y=3时,x-y+xy=5当x=2y=-3时,x-y+xy=-1当x=-2y=3时,x-y+xy=-11当x=-2y=-3时,x-y+xy=7

X-3绝对值+Y+2绝对值=0X-3绝对值=0X-3=0X=3Y+2绝对值=0Y+2=0Y=-2x+y/xy=1/-6

3x+2y+1绝对值+(3x-4y+7)²=0所以3x+2y+1=03x-4y+7=0相减6y-6=0所以y=1x=(4y-7)/3=-1所以xy=-1

X-2y=0,x+y-3=0解得x=2,y=1所以xy=2.

xy>0则x和y同号所以x=2,y=3或x=-2,y=-3所以x+y=5或-5|x+y|=5x-y=-1或1|x-y|=1所以原式=5-1=4再问：你确定再答：嗯

∵|x-y+2|与|x+y-1|为相反数∴x-y+2=x+y-1=0∴x=-1/2y=3/2∴xy=-3/4∴xy负倒数为4/3

设X,Y均为正数.有XY-2X+Y=4(X+1)(Y-2)+2=4(X+1)(Y-2)=2所以X=0,Y=4或X=1,Y=3.设X为负数,Y为正数有-XY-2X+Y=4得(1-X)(Y+2)-2=4(

由{x,xy,lg(xy)}={绝对值x,y,o},有lg(xy）=o即xy=1若y=1则左边集合x=xy故绝对值x=1从而绝对值y=1故x^2+y^2=2log(x^2+y^2)=log2（事实上可

|x-y|=4,xy=-3(x+y)^2=(x-y)^2+4xy=14-12=2x+y=根2,-根2xy^2+x^2y=xy(x+y)=-3根2,3根2再问：(x+y)^2=(x-y)^2+4xy=1

因为xy(y^2+y)-y^2（xy+2x）-3xy=xy^3+xy^2-xy^3-2xy^2-3xy=-xy^2-3xy根据x+y=4,x-y的绝对值=6,可以写出两个方程组x+y=4,x-y=6和

即x+y-5=0xy-4=0所以xy=4x+y=5两边平方x²+2xy+y²=25x²+y²=25-2ab=17(x-y)²=x²-2xy+

有题意得x+y-3>=0xy+x+y-2>=0因为根号x+y-3+绝对值xy+x+y-2=0则x+y-3=0xy+x+y-2=0xy=-1x+y=3x^2+y^2=11x/y+y/x=(x^2+y^2

|x\=4x=±4|y|=2y=±2xy

正负12..正负1正负10负2013再问：我想追问再答：恩客气了

∵xy＜0∴1、x0x的绝对值等于2,x=-2y的绝对值等于3,y=3则xy等于-2*3=-62、x>0,y