cái bài này mình lại thấy trong sách nâng cao

cậu gke quá nhể

mình bạn biết làm chắc

bạn tưởng tôi còn ko có sách á

tôi tham khảo trong sách nâng cao chứ ở đâu

You shouldn't break things during Tet

1.she/buy/a lot of souvenirs/lest summer vacation

(+)She bought a lot of souvenirs last summer vacation

(_)She didn't buy a lot of souvenirs last summer vacation

2.Nga/be late for school/yesterday morning

(_)Nga was late for school yesterday morning

(?)Was Nga late for school yesterday morning?

3.I/speak to her about my vacation

(+)I spoke to her about my vacation

(_)I didn't speak to her about my vacation

4.the chidlren/be hoppy in their trip to Nha Trang

(+)The children were happy in their trip to Nha Trang

(_)The children weren't happy in their trip to Nha Trang

Gọi d=ƯCLN(2n+2021;2n+2023)

=>2n+2023-2n-2021 chia hết cho d

=>2 chia hết cho d

mà 2n+2021 ko chia hết cho 2

nên d=1

=>ĐPCM