设A={x属于Z//x/小于等于6} B={1 2 3},C={3,4,5,6},求 (1)A交(B交C) (2)A交C a(B交C)

问题描述:

设A={x属于Z//x/小于等于6} B={1 2 3},C={3,4,5,6},求 (1)A交(B交C) (2)A交C a(B交C)

A={-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6}
B={1,2,3}
C={3,4,5,6}
A∩(B∩C)={-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6}∩{3}={3}.
第二个没看懂