Bài 2: Cho ABC có BA=3dm, BC = 4dm, CA= 5dm. ABC có phải là tam giác vuông không ? Vì sao ? Cho ADC có AC = 5cm; AD = 12 cm; DC = 13cm. ADC là tam giác gì? Vì sao ? Bài 3: Cho tam giác DEF nhọn. kẻ DH EF. Biết DE = 13cm; DH = 12cm; HF = 16cm. Tính chu vi và diện tích DEF. Bài 4: Cho tam giác ABC có AB = 6cm, AC = 8cm và BC = 10cm. a) Chứng tỏ tam giác ABC vuông. b) Kẻ phân giác BD và CE (D thuộc AC, E thuộc AB), BD và CE cắt nhau tại I. Tính số đo góc .

1 tế bào của cơ thể A,1 tế bào của cơ thể B cùng nguyên phân tạo ra 40 tế bào con a)tính số đợt nguyên phân của mỗi tế bào b)tính tổng số NST đơn mới của tế bào A và tế bào B (biết 2n=18)

1. Act 1 (Ex4-p13): Look at the pictures and use the prompts to make complete sentences about traffic problems in big cities in Viet Nam. 1. (example) One / of / traffic problems / our big cities / be / there /be/ too many people / using / roads. => One of the traffic problems in our big cities is that there are too many people using the roads. 2. There / be / too many vehicles / roads. 3. Many roads / be / narrow / bumpy / and / become / slippery / after / rain. 4. There / be/ traffic accidents / every day. 5. Wild animals / run across / road. 6. Many young people / ride / bikes / dangerously. Can you think of more traffic problems in big cities? List them out! 2. Act 2: 1) Read the passage below, underline the traffic problems and number them from 1 to 3. 2) Circle the linking words used to connect the problems. Ho Chi Minh, the city where I live now, has bad traffic problems. There are many reasons for this. Firstly, there are so many vehicles on the streets and alleys, from buses, cars, to motorbikes, bicycles. The city has the most motorbikes in this country. Moreover, the streets are very narrow and poor-quality. They are easily flooded when it rains so heavily. The streets and alleys become bumpy. Many road users don’t obey the traffic rules. They usually drive and ride very dangerously. As a result, there are traffic accidents every day in this city.

VI. Use the suggested to make sentences. 1. What time / Nga / get / morning? ..................................................................................................................................... 2. You / can / games / afternoon / but / must / homework / evening ..................................................................................................................................... 3. It is / cool / dry / November /April ..................................................................................................................................... 4. When / it / hot / we / often / go / swim ..................................................................................................................................... 5. Last summer/ Nam/ spent/ holiday/ Singapore/ his family

V. Give the correct form of the following verbs. 1. What (do)...........................your sister doing now ? She (skip )............... 2. There (be)..................a lot of people at the party last night. 3. Kate (play)................volleyball every afternoon, but she (play)..............badminton now. 4. We should (do )..........................morning exercises 5. He (see)................................... a big dragon in his dream. 6. Laura (be)...............from Canada. She (speak).................. English and French. She (come).........to Vietnam tomorrow. She (stay)..........in a hotel in HCM City for 3 days. She (visit) ............... a lot of places of interest in Viet Nam. 7. My brother can (swim ).................................... 8. I prefer (like).......................in a village because it is peaceful. 9. There ( be).......................................... a chair and two tables in the room.

Trình bày đặc điểm lãnh thổ Việt Nam

IV. Complete the words in the blanks. 1. My father works for a company (1)............... Monday (2) ............... Friday. 2. He lives (3)............................... a house (4) .................. the countryside. 3. Lan is standing near the store and she is waiting (5) ........................ the bus. 4. I agree (6).............. you about that. 5. I have English...............Wednesday and Friday 6. Look (8) ........................ the picture (9) ....................the wall, please!

Một khu đất hình thang có đáy bé ngắn hơn đáy lớn 12m và bằng 2/5 đáy lớn.Chiều cao bằng trung bình cộng của hai đáy.Hxy tính diện tích của khu đất hình thang đó

Lấy điểm O thuộc đường thẳng xy. Trên hai nửa mặt phẳng đối nhau bờ xy ta vẽ hai tia Om và On ko đỗi nhau. Chứng tỏ rằng có một trg hai tia Ox và Oy nằm giữa hai tia Om và On

1)3x+27=9 x+(-35)=18 3x-5=-7 -13 -2x-(-17)=15 2x-18=10 2x+12=3x-21 |x|-10=-3