2*4 là 2 mũ 4 nha bạn

16 = 2*4

28 = 2*2 .7

42 = 2.3.7

BCNN( 16,28,42 ) = 2*4.3..7 = 338

tìm và sửa lỗi sai

1. my friend has a short brown hair and an oval face

2. because Nga is very keen on the school's singing competition, she is taking part on it tomorrow

3. I have an important maths exam tomorrow afternoon, so I do a lot of maths

4. the painting competition will strart at his school on the 17th of October

5. my dog has a long tail, big eyes and a yellow fur