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Đáp án: $\begin{array}{l}a)1666\\b)6000\\c)3400\\d)560\\e)78900\end{array}$
Giải thích các bước giải:
$\begin{array}{l}a)815 + 666 + 185\\ = \left( {815 + 185} \right) + 666\\ = 1000 + 666\\ = 1666\\b)1677 + 1969 + 1323 + 1031\\ = \left( {1677 + 1323} \right) + \left( {1969 + 1031} \right)\\ = 3000 + 3000\\ = 6000\\c)2 \times 34 \times 50\\ = \left( {2 \times 50} \right) \times 34\\ = 100 \times 34\\ = 3400\\d)56 \times 4 + 56 \times 3 + 56 \times 2 + 56\\ = 56 \times \left( {4 + 3 + 2 + 1} \right)\\ = 56 \times 10\\ = 560\\e)789 \times 101 - 789\\ = 789 \times 101 - 789 \times 1\\ = 789 \times \left( {101 - 1} \right)\\ = 789 \times 100\\ = 78900\end{array}$
Cho tam giác ABC vuông tại A. Có c = 60 độ và AC =5 cm. Tia phân giác của góc C cắt AB tại D . Kẻ DE vuông góc với BC tại E. Đường thẳng DE cắt AC tại H A/Cm AD=ED B/Cm tam giác ACE là tam giác đều C/Cm CD vuống góc với AE D/Tính độ dài cạnh HB
Cho m gam sát tác dụng với lưu huỳnh ở nhiệt độ cao trong điều kiện không có không khí được 14,4g hồn hợp chất rắn A .Cho A tam hoàn toàn trong dung dịch HCL dư .sau phản ứng thu được 4,48l hồn hợp khí ở điều kiện tiêu chuẩn .tìm m
Ai giúp mình với ak hứa vote 5 sao
Mn giải giúp em vs ạ Hpt :x+13y bằng y 14/5x+2/5y bằng 18y
giúp em vs học ngu văn quá đi
BÀI TẬP VỀ THÌ TƯƠNG LAI ĐƠN Bài 1: Cho dạng đúng của động từ trong ngoặc. 1. I (do)__________it for you tomorrow. 2. My father (call)_____________you in 5 minutes. 3. We believe that she (recover)_______________from her illness soon. 4. I promise I (return)______________to school on time. 5. If it rains, he (stay)____________at home. 6. You (take) me to the zoo this weekend? 7. I think he (not come)_______________back his hometown. Bài 2: Hoàn thành các câu sau: 1. A: “There's someone at the door.” B: “I ______________ (get) it.” 2. Joan thinks the Conservatives _______________ (win) the next election. 3. A: “I’m going to move my house tomorrow.” B: “I _________________ (come) and help you.” 4. If she passes the exam, she _____________ (be) very happy. 5. I ____________ (be) there at four o'clock, I promise. 6. A: “I’m cold.” B: “I ____________ (turn) on the fire.” 7. A: “She's late.” B: “Don't worry she ______________ (come).” 8. The meeting _________________________ (take) place at 6 p.m. 9. If you eat all of that cake, you _______________ (feel) sick. 10. They ____________ (be) at home at 10 o'clock. Bài 3: Hoàn thành các câu sau: 1.I'm afraid I _________________________ (not/ be) able to come tomorrow. 2. Because of the train strike, the meeting _________________________ (not/ take) place at 9 o'clock. 3. A: “Go and tidy your room.” B: “I _________________________ (not/ do) it!” 4. If it rains, we _________________________ (not/ go) to the beach. 5. In my opinion, she _________________________ (not/ pass) the exam. 6. A: “I'm driving to the party, would you like a lift?” B: “Okay, I _________________________ (not/ take) the bus, I'll come with you.” 7. He _________________________ (not/ buy) the car, if he can't afford it. 8. I've tried everything, but he _________________________ (not/ eat). 9. According to the weather forecast, it _________________________ (not/ snow) tomorrow. 10. A: “I'm really hungry.” B: “In that case we _________________________ (not/ wait) for John. Bài 4: Viết thành câu hoàn chỉnh dựa vào những từ gợi ý: 1. She/ hope/ that/ Mary/ come/ party/ tonight. - She hopes that Mary will come to the party tonight. 2. I/ finish/ my report/ 2 days. _________________________________________ 3. If/ you/ not/ study/ hard/ ,/ you/ not/ pass/ final/ exam. _________________________________________ 4. You/ look/ tired/ ,/ so/ I/ bring/ you/ something/ eat. _________________________________________ 5. you/ please/ give/ me/ lift/ station ? _________________________________________ 5. Bài tập thì tương lai gần Bt1.Chia động từ đúng trong câu 1. He (come) to her grandfather’s house in the countryside next day. 2. She (go) camping this month. 3. I (have) my hair cut tomorrow because it’s too long. 4. He (buy) a new house next year because he has had enough money. 5. Our grandparents (visit) our house tomorrow. They have just informed us. 6. My mother (play) tennis in 20 minutes because she has just worn sport clothes. 7. My father (go) out because he is making up her face. 8. They (sell) their old house because they has just bought a new one. Bài tập 2: Chia động từ trong ngoặc ở thời tương lai đơn hoặc tương lai gần. 1. Look at those black clouds. It (rain)............ 2. I feel terrible. I think I (be)............ sick. 3. Tom (probably/ get)............ here at about 8 o’clock. 4. I think Sarah (like)............ the present we bought for her. 5. We (visit)............ my grandparents this evening. 6. “Gary phoned you while you were out”. OK. I (call)............ him back. 7. This cheese looks horrible. I (not eat)............ it. 8. Tom (not/ pass)............ the exam. He hasn’t studied hard enough. 9. “Are you going out this morning?” “No. I (tidy)............ my room”. 10. (you/ watch)............ television this evening? Bài tập 3: Điền since hoặc for vào chỗ trống: 1. It has rained ............ lunchtime. 2. My boss will go away ............ the next ten days. 3. I haven’t seen Linh ............ my birthday. 4. She has been away ............ five days. 5. We’ve already waited ............ a year. 6. They have been there ............ a few minutes. 7. That building has been there ............ the 19th century. 8. Have you learnt English ............ a long time? 9. The house is very dirty. We haven’t cleaned it ............ ages.
Giúp mình với ạ. Làm hết nha. Mình đang cần rất gấp luôn. Sắp nộp rồi
Viết thành bài văn hoàn chỉnh cho đề văn Nhân dân ta có câu tục ngữ: “Đi một ngày đàng, học một sàng khôn.”. Hãy giải thích nội dung câu tục ngữ đó. giúp mình với mình đã phải tạo rất nhiều acc để làm mỗi bài này :(( bạn chuyên văn ơi giúp với
gấp nhaaaaaaaa giúp em đi lẹ lên nhaaaaaa I/ Choose the best ones ( passives : is / are / am + V/3) 1. In the USA, millions of old car tires _________ away every year. A. Is thrown B. are threw C. are thrown D. threw 2. In industry, most glass ____________ . A. Are recycled B. were recycled C. recycled D. is recycled II/ Rewrite: is / are / am + V/3 ( place ) + ( by .. ) ( time ) 1. His parents takes Nam to the zoo every month. -> Nam _________________________________ 2. They throw away billions of cans every year. ->Billions of cans _________________________ III/ Rewrite : will / must/ should / can + be V/3 … 1. Lan must do the housework tomorrow morning. The housework __________________________ 2. Nam can repair your bike right now. Your bike ________________________________ IV/ Rewrite : adj + to V/1 <-> adj + that + S + V …. 1. I was very delighted that I passed the final exams. I was very delighted to ______________________ 2. We were sorry to hear about your father`s illness. We were sorry that we ______________________ 3. He was very surprised that he got your letter. He ________________________________________ 4. She was happy to receive a lot of birthday presents. She ______________________________________
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