5 Find and correct mistake for each sentence below

1 May you do a favor?-..............

2 Certainly. What must I do for you? -.......................

3 I am busy at doing my homework now. Should you help cook the meal? -.................

4 I'm sorry but I dislike to cook.-................

5 Do you think children often in sít going out on Sunday?-.............

6 Sure, They are interested in doing something different at weekends-.....................

7 Do you mind to go with us to the zoo?-..................

8 I don't mind at all. I'm also keen on do something different on Sunday-...............

4 Choose the best anser to complete each sentences below

1 ...............problem, Sir ( any,without,No)

2 ..........I help you madam?( Should, may,need)

3 Yes,That 's very ...............of you (help/kind/fine)

4 Could you........... me a favor? (do/make/take)

5 I'm...........I'm really busy. ( pity/not good/ sorry)

2 Có số dạng \(1+2^{3^{1966}}\) có phải là số nguyên tố không

1 a) Tìm các giá trị x,y,z,t thoả mãn các điều kiện sau:

x^2+y^2+z^2+t^2=1 và xy+yz+tx=1

b) Tìm các giá trị x,y,z thoả mãn các điều kiện : x+y+z=6 và x^2+y^2+z^2=12