Bài 2:Cho hình chữ nhật ABCD ,Qua A kẻ đường thẳng vuông góc với AC cắt CB,CD kéo dài tại E,F. a/c/minh : CB.CE = CD.CF giúp e gấp ạ

a,-2/3+3/4-1/2+1/6 b,1/10-(-1)/12+1/5 c,27/23-(-5)/21-4/23+16/21+1/2 d, 3/11.( 2 2/3-1,75) e,(3/4+0,75 ).(4/5-0,6) f, 3 2/5. 6 1/4+3 2/5.3 3/4 g, 3 1/9. 12 5/7-9 5/7.3 1/9 h, 3,2.15/64-(4/5+2/3): 3 2/3

Các anh chị nào biết giải bài giupps em với ạ em cảm ơn rất nhiều

nhờ a Maiyeumotnguoi giải giúp e ạ VI/ Hoaøn thaønh ñoaïn vaên vôùi nhöõng töø trong khung: sit powerful diseases rapidly from not television space way called Our world is changing …………………….. . Every day we are going farther faster. Sixty years ago we didn’t have airplanes, but today we are sending men into ………………….. . Every day we are sending news faster. Today a family in San Francisco can ……………..in its living room and watch alive ……………….program from Paris. And every day we are conquering more …………………… Less than ten years ago people feared the dreaded disease ………………….polio, but today ……………………..vaccines have almost wiped it out. Our changing world is ……………….always comfortable and secure. Many people don’t like to change. They like the ……………it is. Ye more changes are coming: Ten years …………………now few people will live the way they are living. - conquer: cheá ngöï - polio: beänh baïi lieät - wipe out : tieâu dieät VII/ Saép xeáp nhöõng caâu sau thaønh moat ñoaïn hoäi thoaïi hôïp lyù: ____ Do you want to send it by airmail or surface mail? ____ Oh! That’s too expensive. ____ All right. ____ Excuse me. I’d like to send this parcel to Ha Noi. ____ That’s better. I’ll send it surface. ____ How much is airmail? ____ Surface mail is cheaper. It’s only 22,000 dong. ____ I’ll have to weigh the parcel first. Four kilograms. That will be 43, 500 dong.

vẽ đậu mầm nl:avatar tui đẹp ko các bạn

Exercise 1: B. disadvantage C. photographer C. transportation 1. A. authority D. relationship 2. A. combination B. satisfaction D. necessary 3. А. hockey B. involve C. review D. select C. technician C. origin 4. A. defensive B. spectator D. wonderful В. ехample В. ехpect 5. A. eleven D. synthetic 6. A. exhaust C. extra D. except C. decide C. respect C. convenient 7. A. discharge B. honey D. appoint 8. А. саptain B. belong D. avoid 9. A. evaluate B. favorable D. relationship 10. A. signature B. scholarship C. terminal D. transaction Exercise 2: Question 1: A. refuse B. musician C. history D. mechanic Question2: A. museum B. destroy C. threatened D. economy Question 3: A. Computer B. communicate C. comfortable D. flamingo Question 4: A. twenty B. hundred C. thirteen D. fifty Question 5: A. infer B. answer refer D. deter Question 6: A. exception B. linguistics C. paragraph D. specific Question 7: A. measurement C. economic D. engineer Question 8: A. achievement C. confinement D. involvement Question 9: A. teacher B. prefer C. offer D. flower Question 10: A. overwhelming B. intellectual C. incredible D. optimistic

hợp chất AxOy có phân tử khối là 102.Xác định công thức của hợp chất biết rằng tổng số nguyên tử trong phân tử AxOy là 5

1. Nam is my classmates. He watches TV every night. __________ 2. I think collecting stamps are interesting. __________ 3. My dad cooks very good. He loves preparing meals for our family. __________ 4. I enjoy to ride my bike to school. __________ 5. We usually go in a small lake out of the city at weekends. __________ 6. Do you still play football next year? __________ 7. We like doing fishing because it is relaxing. __________ 8. Do you think bird watching interesting? __________

Giúp mình với ạ Xđ bậc của các hợp chất sau: $C_{2}$$H_{5}$OH; $C_{2}$$H_{5}$$NH_{2}$ ; $CH_{3}$CH($NH_{2}$)$CH_{3}$ ; $CH_{3}$CH(OH)$CH_{3}$ ; $CH_{3}$$NHC_{2}$$H_{5}$ ; $C_{6}$$H_{5}$$N(CH_{3}$)$_{2}$ ; $(CH_{3}$)$_{3}$N

Tính : |1/2 x + 3/5 | = 1/2 Lưu ý : x ko phải là dấu nhân nhé