Cho tam giác ABC, lấy M, N , K lần lượt là trung điểm của AB, AC, BC; gọi I là trung điểm của MN. Chứng minh: A, I, K thẳng hàng

II. Complete the zero conditional sentences. Use the correct form of the verbs in brackets.
~ When they ...go... on holiday, a neighbour ...feeds... their cat. (go, feed)
8. He .............................. early when he .................................... study a lot. (get up, have to)
9. If I ................................. late, I usually ................................. to the college. (not be, walk)
10. What ........................ if you .............................. problems getting to sleep? (you / do, have)
11. If James ........................... to see her, she .............................. the door. (come, not answer)
12. When I ................................. advice, I usually ................................. to my older brother.
(need, talk)
13. ................................. your mobile when you ................................. in a restaurant? (you /
turn off, be)

IV. Complete the conversation. Use the correct form of the verbs in brackets.
Do you think Tina will be OK in Paris?
I’m sure she (0) ...will be... (be) happy if she (22) .................................... (make) friends
quickly and if she (23) ................................. (feel) lonely at first, she (24) ........................
(can / phone) us.
She’s going soon. If we (25) ................................. (not organise) a party now, it (26)
.............................. (might / be) too late.
She (27) ................................. (be) disappointed if she (28) .................................... (not
get) a present from us. If we all (29) ................................. (give) some money, we (30)
............ ................................. (can / get) something nice.
If you (31) .............................. (see) her, (32) .............................. (ask) her if there’s
anything she needs, but (33) .............................. (not mention) the party. Then it’ll be a surprise!

Cho tam giác ABC có BC=8cm, gọi M, N lần lượt là trung điểm của AB, AC.

a) Tính MN và chứng minh MNCB là hình thang.

b) Gọi E, Q lần lượt là trung điểm của MB, NC. Tính EQ. c) BN, CM cắt EQ lần lượt tại I và J. Tính EI; JQ; EJ

. d) Chứng minh MNJE là hình bình hành