Tính bằng cách thuận tiện nhất :372,463×999+372,463=

số dư của phép chia 37,99:16 nếu đlấy đến 2 chữi số ở phần thập phân của thương là

Cho 0,015 ml oleum vào nước được 200ml dd X. để trung hòa 100ml đ X cần 200ml dd NaOH 0,05M. tính %mS trong oleum

Tìm các giá trị của m để phương trình có hai nghiệm dương phân biệt: (m – 2)x^2 – 2mx + m + 3 = 0 Giải dùm e với đang cần gấp ạ

Xà phòng hóa 13,2 gam etyl axetat bằng 200ml dung dịch NaOH 1,5M. Sau khi phản ứng xảy ra hoàn toàn cô cạn dung dịch thu được chất rắn khan có khối lượng là A. 24,6g. B. 18,3g. C. 12,3g. D. 16,2g.

Chứng minh ΔABC là tam giác vuông trong các trường hợp sau 9) 20AB=15AC=12BC 10) 65AB=156AC=60BC Toán 7 ạ

P/s: Cần người giúp a !!! Vote 5 sao nhé 4.1/ Em hãy viết đoạn văn ngắn từ 7-10 câu chủ đề “Mùa xuân ” có sử dụng trạng ngữ chỉ nơi chốn và gạch chân trạng ngữ vừa tìm được 4.2/ Đặt câu trạng ngữ mà em vừa gạch chân đó

Cho a gam kim loại nhôm tan hoàn toàn trong dd axit clohdric (HCl). a) Viết phương trình phản ứng xảy ra? b) Tính a biết thể tích khí hiđro thoát ra (ở đktc) là 6,72 lít? c) Tính khối lượng muối nhôm clorua tạo thành ?

I. Reading comprehension: A. Read and choose the best answer among A, B, C or D: Ba’s class has a (1)……….on waste paper. His friends are so (2) …….to learn that every day throughout the world, millions of newspapers and paper bags are screwed and (3)……. away. And people are collecting waste paper and(4)………. it. Making paper(5) ……. a lot of trees and labor. Now, if people recycle(6)…….paper they can save(7)……. and money. Especially, people can save the natural (8)……… For every ton of (9) ………… newsprints, ten trees can be saved. The more paper people save, the (10) …….…… natural resources are preserved. 1. a. discuss b. discussion c. discussing d. to discuss 2. a. surprised b. surprising c. surprise d. to surprise 3. a. put b. cut c. thrown d. brought 4. a. recycle b. recycled c. to recycle d. recycling 5. a. requires b. has c. gets d. cuts 6. a. waste b. new c. save d. small 7. a. money b. people c. labor d. work 8. a. beauty b. paper c. resources d. animals 9. a. recycling b. recycled c. recycle d. to recycle 10. a. much b. most c. more d. many II. Read and choose True, False or Not information: Yesterday, when I was riding along a busy street, I saw an accident. A woman was knocked down when she cross the street at the zebra crossing. Many people stopped to offer their help. A policeman arrived and asked a young man to telephone for an ambulance. While waiting for the ambulance, the policeman and some people tried to stop the bleeding. They used a handkerchief to cover the wound, then put the pressure on it and held it tight. They tried to talk to her in order to keep her awake. After about ten minutes, the ambulance arrived and the woman was taken to the hospital. 16. An accident happened on the busy street yesterday. ………. 17. A policeman arrived and telephoned ………. 18. A woman had a bad cut on her head and it bled very badly. ………. 19. They kept her awake by talking to her until she was taken to the hospital by an ambulance after about ten minutes. Thanks!!!

I. Tìm lỗi sai và sửa: 1. You (will) be (gave) a present when you (go) to (the) party next Saturday. A B C D 2. It is (unhealthily) to (live) (in) many of the (world’s) cities. A B C D 3. We (began) the meeting (by) a discussion (about) (recycling). A B C D 4. Miss Blake (is) one (of) the (represents) from Friends (of) the Earth. A B C D 5. The project (will) be (show) to (the) public when it (is) finished. A B C D 6. We must (act) now before it is too (late) (doing) anything (about) the problem. A B C D 7. (Can’t) we deal (with) this (now) instead of (wait) until tomorrow? A B C D 8. (Mixture) the (flour) (with) the eggs (and) butter. A B C D 9. The govermment (wants) everyone (to) (recycle) 25% of their household (wasting). A B C D 10. You ought (to) (improving) your French before (going) to work (in) Paris. A B C D 11. (Please) contact (with) me (if) you have (any) questions. A B C D 12. They (are) trying (to) (stop) the (reused) of needles by addicts. A B C D 13. The shop promised (to) keep the goods (for) me if I (took) a (deposit). A B C D 14. It is (danger) (for) people (to) do their shopping (in) the city center. A B C D 15. (Keep) the cheeses (freshly) by (wrapping) each (one) individually. A B C D 16. Instead (for) (reusing) plastic bags, we (shouldn’t) use (them) at all. A B C D 17. We (are) looking (forward) to (see) you (in) April. A B C D 18. We can (make) vegetable matter (to) (compost) and (fertilize) our field. A B C D Thanks nhiều!!!