8900 kg/m³

Trình bày tự luận

nhanh giúp e với ạ 

Chia dạng đúng của các từ trong ngoặc:
One day, my uncle left work very late - about 7.30 pm. He ______ (be) very tired because he ________ (spend) the whole afternoon writing emails. When he left, he _________ (write) emails for more than three hours! He ______ (start) to drive home but he got stuck in a lot of traffic because there _________ (be) a very bad accident at seven o'clock. When he finally _______ (get) home, it was 9.40 - he ________ (drive) for almost two hours. Then he ________ (realise) that he couldn't get into his house because he _______ (leave) his keys on his desk in the office!

Tính nhanh:
\(\dfrac{1988\times1996+1997+1985}{1997\times1996-1995\times1996}\)

57 phút

C