指出下列各集合中,那些事空集?哪些是有限集?那些是无限集?(1){x丨x+1=0} (2){x丨x方+1=0 \(3){(x,y)丨x=y 4 {x丨-5小于等于x
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![指出下列各集合中,那些事空集?哪些是有限集?那些是无限集?(1){x丨x+1=0} (2){x丨x方+1=0 \(3){(x,y)丨x=y 4 {x丨-5小于等于x](/uploads/image/z/13362091-43-1.jpg?t=%E6%8C%87%E5%87%BA%E4%B8%8B%E5%88%97%E5%90%84%E9%9B%86%E5%90%88%E4%B8%AD%2C%E9%82%A3%E4%BA%9B%E4%BA%8B%E7%A9%BA%E9%9B%86%3F%E5%93%AA%E4%BA%9B%E6%98%AF%E6%9C%89%E9%99%90%E9%9B%86%3F%E9%82%A3%E4%BA%9B%E6%98%AF%E6%97%A0%E9%99%90%E9%9B%86%3F%281%29%7Bx%E4%B8%A8x%2B1%3D0%7D+%282%29%7Bx%E4%B8%A8x%E6%96%B9%2B1%3D0+%5C%EF%BC%883%EF%BC%89%EF%BD%9B%EF%BC%88x%2Cy%29%E4%B8%A8x%3Dy+4+%EF%BD%9Bx%E4%B8%A8-5%E5%B0%8F%E4%BA%8E%E7%AD%89%E4%BA%8Ex)
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指出下列各集合中,那些事空集?哪些是有限集?那些是无限集?(1){x丨x+1=0} (2){x丨x方+1=0 \(3){(x,y)丨x=y 4 {x丨-5小于等于x
指出下列各集合中,那些事空集?哪些是有限集?那些是无限集?(1){x丨x+1=0} (2){x丨x方+1=0 \
(3){(x,y)丨x=y 4 {x丨-5小于等于x
指出下列各集合中,那些事空集?哪些是有限集?那些是无限集?(1){x丨x+1=0} (2){x丨x方+1=0 \(3){(x,y)丨x=y 4 {x丨-5小于等于x
(1){x丨x+1=0}
无限集
(2){x丨x方+1=0 \
空集
(3){(x,y)丨x=y
无限集
4 {x丨-5小于等于x
1是有限集,2是空集,3,4是无限极
有限集 1,4
空集2
无限集3