A={(x,y)||x|+|y|=a,a>0},B={(x,y)|(xy)+1=|x|+|y|},若A交B是平面上正八边
已知集合{x,y,x+y},B={0,X2,xy}是A=B,求x,y的值
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
设A=2x-3xy+y+x-3y,B=4x-6xy+2y+4x-y,若|x-3a|+(y+3)=0,且B-2A=a.求A
设集合A={x-y,x+y,xy}B={x²+y²,-x²-y²,0}若A=B求
设集合A={x-y,x+y,xy},B={x²+y²,x²-y²,0},若A=B
设平面点集A={(x,y)|(y-x)(y-1/x)>=0},B={(x,y)|(x-1)^2+(y-1)^2
设集合A={(x,y)/2x+y=1,x,y属于R},B={(X,Y)/a的平方x+2y=a,x,y属于R},若A交B=
若A={(x.y)|2x+3y=1}.B={(x.y)|3x-2y=3}则A交B等于?
(x-A)*(B-y)=x^2-9xy+8y^2,求A,B
1、设集合A={x—y,x+y,xy},B={x²+y²,x²—y²,0},且A
A:{(x,y)|y=x方+2x},B:{(x,y)|y=x+a},A交B的真子集为空集,求a的范围
已知x,y是实数,向量a,b不共线,若(x+y-1)a+(x-y)b=0,则x=?y=?