Question

X≥5,Y≥12,求X∩Y,X∪Y

Answer 1

方法如下，
请作参考：

Answer 2

X≥5,Y≥12,则X∩Y=[12,+∞)，X∪Y=[5,+∞)

Answer 3

X≥5,Y≥12,
X∩Y={Y≥12},
X∪Y={X≥5}.

Answer 4

X∩Y = [12, +∞) , X∪Y = [5, +∞)

Answer 5

X≥5,Y≥12,

X∩Y={Y≥12},

X∪Y={X≥5}.