Giải thích các bước giải:
$R_{23}=R_2+R_3=3r+5r=8r$
$R_{t đ}=\frac{R_{23}R_1}{R_{23}+R_1}=\frac{8r.2r}{8r+2r}=\frac{16r^2}{10r}=1,6r$
Làm hộ mik với ạ,cảm ơn nhiều ạ
IV. Choose the correct answer in each sentence. 1. Are you interested for/ in photography. 2. This is my best/ favourite book. It’s David Copperfield, by Dickens. 3. I’ve decided to make/ join the local swimming club. 4. Kate usually passes/ spends most of her time reading. 5. Tim has a very interesting fun/ hobby. He builds small boats. 6. What do you like doing in your empty/ spare time? 7. Wendy is a member/ team of the drama club. 8. Anna likes going to the cinema/ cinema. V. Complete the sentences with the correct form of the verbs in brackets. 1. Sally and her family love (go)__________ to the park in the summer. 2. Her mum likes (lie) __________ on the blanket and loves (read) ________ her favourite magazines. 3. Anna’s family (like) ___________ the park because they love (be)__________outdoors. 4. In 2100, people (travel) _______________ in flying cars. 5. We love (watch)_____________ new films, and we often (go) ___________ to watch a new Hollywood film on the weekend. 6. My brother hates (do) _____________ the same things day after day. 7. Our uncle (play) ____________ badminton once a week. 8. My brother (dance) _________________ now. The music is too loud. 9. Matt (move) ________________ to London next year. 10. I enjoy (collect) _____________ dolls and it becomes my pleasure. VI. Write sentences using prompts. 1. Tuan/not/like/cook. …………………………………..……………………………………………………………………… 2. My brother/ like/ play/ table tennis. ………………………………….………………………………………………………………………. 3. Minh/ hate/ eat/ apples. ………………………………….………………………………………………………………………. 4. Ha/ dislike/ play/ the piano. ………………………………………………………………………………………………………….. 5. My parents/ really love/ garden. ………………………………………………………………………………………………………….
Hai điện tích điểm q 1 =10 -9 C và q 2 = -2.10 -9 C hút nhau bằng 1 lực có độ lớn 10 -5 N khi đặt trong không khí. Khoảng cách giữa chúng là: A. 4cm B. 4 cm C. 3cm D. 3 cm
mong mn giải giúp mình ạ , cần gấp quá =)))))
Trong đoạn mạch gồm hai điện trở mắc nối tiếp thì U = U1 = U2; I = I1 + I2; Rtđ = R1 + R2 U = U1 + U2; I = I1 = I2; Rtđ = R1 + R2. U = U1 + U2; I = I1 + I2; Rtđ= R1 + R2. U = U1 = U2; I = I1 = I2; Rtđ = R1 + R2.
Có ai giúp em ko ạ em ko giải được
WRITE A SHORT PARAGRAPH (100-150 WORDS) ABOUT YOUR FAVORITE COMPUTER. How many computers do you have? What kinds are they? Which one do you like the best? Why? Where did you buy it? How much does it cost? What do you often do with it?
giải bài 1.4 trang 7 sgk tr 7 môn sinh học
II.Cho thì hoặc dạng thích hợp của động từ trong ngoặc. 1.We often (play) ________________ tennis in the afternoon. 2.(you be) ________________ free next Sunday? No. I (do) ________________ my homework. 3.Phong (be) ________________ on the phone now. He (talk) ________________ to Tam. 4.Mike (not come) ________________ to our party tonight. 5.We (have) ________________ a test tomorrow morning. 6.She (not call) ______________ her parents every day. She (call) _____________ them every week. 7.Would you like (see) ________________ a movie? 8.Let’s (meet) ________________ in front of the movie theater. III.Đặt câu hỏi cho các câu trả lời. 1._______________________________________________________________________________ - My name’s Trung. 2._______________________________________________________________________________ - I’m thirteen. 3._______________________________________________________________________________ - My date of birth is on July 6th. 4._______________________________________________________________________________ - My address is 263/2 Tran Phu Street. 5._______________________________________________________________________________ - 38 950 963. 6._______________________________________________________________________________ - It’s about 500 meters from my house to school. 7._______________________________________________________________________________ - I walk to school. 8._______________________________________________________________________________ - I live with my parents. IV. Viết câu phủ định và nghi vấn. 1. Mai plays badminton after school. 4. We often have a picnic on weekends. _________________________________ _________________________________ _________________________________ _________________________________ 2. I will be at home tomorrow night. 5. They will go camping next week. _________________________________ _________________________________ _________________________________ _________________________________ 3. She is out at the moment. 6. The students are sitting in class. _________________________________ _________________________________ _________________________________ _______________________________
Hỗn hợp X gồ 2 Kl A và B có tỉ khối lượng 1:1 và khối lượng mol nguyên tử của A nặng hơn B là 8 gam.Trong 33.6 gam X có số mol A khác B là 0.0375
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