Question

[dinh van tien toan]

 cho tap hop A gom cac so tu nhien be hon 13 va lon hon 20

a)chi ra bang 2 cach 

b) tap hop B gom cac so tu nhien x chan 13<x<20.tap hop B la gi cua tap hopA ,ki hieu nhu the nao?

Answer 1

[Conan]

C1:A = tap hop rong

C2:A={x thuoc N | 20<x<13}

B={12;14;16;18}

Tap hop B la chua A

Chuc bn hoc gioi!

mk ko biet viet ki hieu nha 

thong cam

Answer 2

[Nguyễn Hà Trang]

x chẵn mà