bai 1
cho A= {1,2,3,4,5,6} va cho B={1,3,5,7,9}
a) viet tap hop C gom cac phan tu thuoc A ma khong thuoc B
b)viet tap hop D gom cac phan tu thuoc B ma khong thuoc A
c) viet tap hop E gom cac phan tu vua thuoc A va vua thuoc B
d)viet tap hop M gom cac phan tu thuoc A hoac thuoc B
~~~~~~~ Giai nhanh giup minh nha minh dang can gap ~~~~~~~