Kéo đều vật năng có khối lượng m = 10kg lên cao 2m bằng mặt phẳng nghiêng dài 5m , lực cản chuyển động của vật là 20N . Hiệu suất của mặt phẳng nghiêng là: A:83,33% B:33,33% C:66,67% D:100%

1. ngành dịch vụ nào được phát triển mạnh ở hầu hết các quốc gia thuộc Châu Đại Dương 2. ngành kinh tế nào giữ vai trò quan trọng trong tất cả các nước châu đại dương

câu 1 slime bị cứng thì cho gì vào không phải kem dưỡng da??? slime bị chảy thì cho gì trừ borax, activator???

Giúp mình phương trình vô tỉ với ít nhất là 2 câuu

Trả lời nhanh và đúng sẽ được 5 sao:))

Dấu hai chấm trong câu “Cái lặng im lúc đó mới thật dễ sợ: nó như bị gió chặt ra từng khúc, mà gió thì giống những nhát chổi lớn muốn quét đi tất cả, ném vứt lung tung…” có công dụng gì?

$\frac{0,2}{|2x-1|}$ -$\frac{20}{11.13}$ -$\frac{20}{13.15}$ -...-$\frac{20}{53.55}$ = $\frac{3}{11}$

Vẽ anime Ngoài lề: Cho xin ý kiến oc nào đẹp hơn:)

Chứng minh biết a,b>0 ; a+b=1 $\frac{1}{a}$ + $\frac{1}{b}$ $\geq$ $\frac{4}{a+b}$

I. 1. A. thirsty B. throw C. theme D. their 2. A. hear B. near C. Fear D. pear 3. A. learned B. washed C. looked D. watched 4. A. favourite B. light C. nice D. high 5. A. invite B. helicopter C. hi-tech D. automatic II. 1. “ I’ve just received a present from my mother.” A. really B. Thank you C. Congratulations D. Well 2. ................ eat too much salt. It’s not good for you. A. Do B. Don’t C. Please D. Can’t 3. As it’s doesn’t snow in Viet Nam, we cannot ............................ skiing. A. play B. do C. Make D. go 4. He can’t swim ................ he is afraid of water. A. because B. but C. And D. so 5. Last summer, I ............ sailing with my father on the river near my house. A. go B. went C. play D. played 6. ................ did you spend in Ha Noi? -For one week A. How many B. How much C. How long D. How often 7. I ..................that film yet. A. see B. saw C. have seen D. haven’t seen 8. We use ............. to change the channels from a distance. A. remote control B. TV schedule C. newspaper D. volume button 9. Who ................ the first person in the room yesterday? A. is B. are C. was D. were 10. What’s your favourite ................ on TV? - Sports A. subject B. game C. sport D. programme III. 1. Mr. John (be)………………….. principal for our school since last year. 2. I (meet) ………………….. Tom three weeks ago. 3. Mr. Tan ( work) ………………….. for this factory since 2002. 4. You (ever/meet) …………………..………………….. him? IV. 1. In the future, robots will do all the housework instead us. A B C D 2. I’m sorry I won’t able to go to your party on Friday. A B C D 3. I can write with my right hand. I’m left-handed. A B C D 4. Using a lot of plastic bags are bad for the environment. A B C D 5. If we will go shopping tomorrow, I’ll buy some reusable shopping bags. A B C D V. ALBERT PARK Albert Park is located only three kilometers from the Melbourne city center. It is a 225 hectare sporting and recreational park. The park is beautiful, relaxing and fun place to spend the day. You can enjoy a picnic or barbecue at one of the nine picnic areas. There is also a large lake which is home to a gorgeous family of swans and is a lovely place to take a walk. If you are more adventurous, you can take some lessons at the yacht and rowing club or hire a boat just for fun and go for a paddle. Albert Park is host to some of Melbourne’s most exciting events. In May, the ‘Million Paws Walk’ sees many dogs play and run through the park with their owners to raise money for charity. Throughout the year there are various ‘Fun Runs’ and in March the “Footer’s Australian Grand Prix Carnival” is held here. T F 1. Albert park is located only three kilometers from the Melbourne city center. 2. Albert Park has an area of 225 hectares. 3. The park is a nice place for picnics. 4. Here you can see ducks. 5. The yacht and rowing club is only for adventurous people to learn how to row and sail. Làm nhanh giúp mình nha