(X-a)^2+ (Y-b)^2=0 求大神告诉是什么?
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
已知集合A=〖(x,y)/2x-y=0〗,B=〖(x,y)/3x+y=0〗,求A交B
已知|x-y-3|+(a+b+4)²=0,求2a+2b-(a+b)分之(x-y)²-3(y-x)的值
(x-A)*(B-y)=x^2-9xy+8y^2,求A,B
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
集合A={(X,Y)|2X-Y=0}B={(X,Y)|3X+Y=0}C=={(X,Y)|2X-Y=3}求A交B,A交C,
已知集合A={(x,y)|2x-y=0},B={(x,y)|3x+y=0},C={(x,y)|2x-y=3}求A∩B,A
已知x=a,y=b满足方程2x+y=0,求8a+4b-1
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
(1)已知a/x+b/y=1(b不等于y),求x; (2)已知K=y-9/x-m(k不等于0),求x.“/...
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
若A{(X,Y)|Y=x2-2},B{(X,Y)|X=Y2-2},求A∩B