设集合A=[(x,y)x2+y2=4],B=[(x,y)|y=√4-x2],C=[x|y=√4-x2],D==[y)|y
设集合A={y|y=x2+2x+4,x R},B={y|y= x2-4x+3,x R},给出下列结论:
设集合A={(x,y)|y=x2+4x+6},B={(x,y)|y=2x+a},问:
我做对了吗.x2(x-y)+y2(y-x)= x2(x-y)-y2(x-y)=x2-y2=(x+y)(x-y)
4y2-(x2+y)+(x2-4y2),其中x=-28 y=
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,
x2-x-y2-y 解法:=(x2-y2)-(x+y) =(x+y)(x-y)-(x+y) =(x+y)(x-y-1)
已知集合a=(x,y)/x,y∈R 且x2+y2=1
A={y|y=x2-4x+6,y属于N},B={y|y=-x2-2x+18,y属于N},求A交B.
设A=2x2-3xy+y2+x-3y,B=4x2-6xy+2y2+4x-y,若|x-3a|+(y+3)2=0,且B-2A
设集合A={x-y,x+y,xy},B={x2+y2,x2-y2,0},且A⊆B,B⊆A,求实数x,y的值和集合A、B.
已知集合A={(x,y)|x-y+m>=0}与集合B={(x,y)|x2+y2
已知集合A={x|y=x2-2x-3,x∈R},B={y|y=x2-2x-3,x∈R},C={(x,y)|y=x2-2x