1.若丨X丨=丨Y丨,则X=Y()
举一反三
- A={(x,y)丨2x+3y=1},B={(x,y)丨3x+2y=4},则A2229B=
- A={(x,y)丨2x+3y=1},B={(x,y)丨3x+2y=4},则A∩B=
- 设置集合M={x丨-1≤x<2}。N={x丨x≤1},则集合M∩N=() A: {x丨x > -1} B: {x丨x > 1} C: {x丨-1 ≤ x ≤ 1} D: {x丨1 ≤ x ≤ 2}
- 设集合A={x丨-1<x<2},B={x丨1<x<3},则A∪B=______. A: {x丨-1<x<2} B: {x丨1<x<3} C: {x丨1<x<2} D: {x丨-1<x<3}
- 若集合A={x丨丨x-1丨<2},B={x丨丨x-1丨>1},则A∩B= A: (-1,0) B: (-1,0)U(2,3) C: (-1,3) D: (-∞,0)U(3,+∞)