Đáp án:
9.
a.
\({F_A} = dV\)
d: trọng lượng riêng của chất lỏng (\(N/{m^3}\))
V: phần thể tích của vật bị chìm trong nước (\({m^3}\))
FA: lực đẩy acsimet (N)
b.
P=10m=10.2,5=25N
Giải thích các bước giải:
a) bn tự coi sgk
b)
Cho tam giác ABC, trên tia đối của AB lấy điểm E sao cho AE=AB, trên tia đối của AC lấy điểm D sao cho AC=AD. Gọi M và N lần lượt là các điểm thuộc DE, BC sao cho DM= NC. CMR: M, A, N thẳng hàng
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Mọi người làm hộ em ba bài toán này nhé
Task 3. Rewrite the sentences using was or were: 1. I am happy to see you. _____________________________________ 2. Nora is on holidays in Italy. _______________________________________ 3. This is my favourite book. _______________________________________ 4. The dogs are under the table. _______________________________________ 5. Mary is not at school. _______________________________________ 6. My mobile is broken. _______________________________________ 7. It is a very interesting film. _______________________________________ 8. They are good students. _______________________________________ 9. We are good sportsmen. 10. This dog is very friendly. _______________________________________ 11. Tom is my best friend. _______________________________________ 12. I am at the shopping centre. _______________________________________ Task 6. Ask questions to the underlined words: 1. We went to the sports club yesterday. _______________________________________ 2. Pam was the winner of the competition. _______________________________________ 3. They bought two presents yesterday. _______________________________________ 4. Andrew visited his grandparents. _______________________________________ 5. Tom played the guitar very well. _______________________________________ 6. Ben told me a funny story yesterday. _______________________________________ 7. They were at the theatre yesterday. _______________________________________ 8. They were at the meeting yesterday. _______________________________________ 9. I rode my bike in the street yesterday. _______________________________________ Task 7. Correct the mistakes: 1. We didn’t went to the zoo yesterday. _______________________________________ 2. Tom go to the club yesterday. _______________________________________ 3. We didn’t bought flowers. _______________________________________ 4. Paul weren’t at the lesson yesterday. _______________________________________ 5. Mona not was at the disco club. _______________________________________ 6. They have a nice time yesterday. _______________________________________ 7. I didn’t late for my English yesterday. _______________________________________ 8. I not phoned to my friend yesterday. _______________________________________ 9. Liz send two SMS five minutes a
PART D. WRITING I. Re-arrange the words to make meaningful sentences. 1. will/ street./ along/ More/ this/ be/ trees/ planted =>___________________________________________________________________ 2. two hours/ It/ to/ letter./ me/ that/ takes/ write =>___________________________________________________________________ 3. from/ about/ the/ my/ town./ three kilometers/ It/ house/ to/ is/ nearest =>___________________________________________________________________ 4. a/ train ?/ a/ you/ Will/ take/ taxi/ or =>____________________________________________________________________ 5. by/ go/ My/ used/ motorbike./ to/ father/ to/ work =>_____________________________________________________________________
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