a) Bất pt bậc nhất một ẩn là a. 0x+2<0 b. 3x+5<=0 c. x^2>=0 d. 2/x^2+1 b) Rút gọn biểu thức A=5x-2-|x-3| với x>= 3 ta được a.4x-5 b. 6x-5 c.6x+1 d. 4x+1 c) Cho hình lăng trụ đứng ,biết dt đáy là 20cm^2,chiều cao 7cm.Thể tích hình lăbg trụ đứng bằng a. 140cm^3 b. 166cm^2 c. 126cm^2 d. 140cm^2

Mọi người giúp em với ạ, em cảm ơn nhiều nhiều nhe 1. Nhỏ từ từ 500ml dung dịch X (gồm NaOH: 1,5M và KOH 2M) vào 500ml dung dịch Y (gồm AlCl3 0,25M và Al(NO3)3 0,75M) thì thu được m gam kết tủa keo trắng. Tìm m. 2. Nhỏ từ từ 500ml dung dịch X (gồm NaOH: 1,5M và KOH 1M) vào 500ml dung dịch Y (gồm ZnCl2 0,25M và ZnSO4 0,75M) thì thu được m gam kết tủa keo trắng. Tìm m. *2 bài này không giải theo cách dùng pt ion đc ko ạ?

Đa thức (-3x^3+5x+4) - (3x^2-6x+4) thu gọn là

giải chi tiết ạ, type ra thì được tlhn ạ

There is little __________ of the president being re-elected. (likely)

London, the capital of England and the (1) ________ Kingdom, is the largest city in Europe. It is (2)______ on the river Thames and has a (3)______ of 2,000 years. Over eight million people live in London. Hundreds of thousand people (4)______ each day into London to work. London has an oceanic climate, but generally it is a dry city. However, London (5) _______ often very cloudy. On average it rains mildly just every day. Temperature extremes for all sites in the London area range (6) ________ 38.10C at Kew during August, down to -16.10C at Northolt during January 1962. London’s largest industry is finance. Together (7)________ New York, the city of London is one of the world’s largest financial centers, (8) ___________ London a major world influence. However, like many big cities, London has problems with traffic (9)______ pollution. Millions of people (10) ______ the London Underground a day, but there are still too many buses and trams in the streets. The air isn’t clean, but is cleaner than it was 100 years ago.

Dân cư châu Mĩ có đặc điểm gì ?

Bài 2: Viết lại những câu dưới đây sao cho nghĩa không đổi 1. The last time Chirs visited his village was 5 years ago. => Chirs hasn’t…………………………………………………………………………………… 2. I last came to jullian’s home is 6 days ago => I haven’t………………………………………………………………………………………… 3. It has been 11 years since my grandpa passed away => My grandpa …………………………………………………………………………………… 4. I last had my hair cut in Feb. => I haven’t………………………………………………………………………………………… 5. The last time we talked was 5 hours ago. => We haven’t…………………………………………………………………………………… 6. It has been a long time since we last played with each other. => We haven’t…………………………………………………………………………………… 7. When did you have 100 scores in Japanese? => How long……………………………………………………………………………………..? 8. This is the first time I had such an amazing bed =>I have never…………………………………………………………………………………… 9. I haven’t seen Anna for 10 days. => The last………………………………………………………………………………………… 10. Today is Wednesday. I haven’t taken a bath since last Sunday. => It is……………………………………………………………………………………………

Hệ thống núi cao của châu Âu tập trung ở phía

Bài 2: Chia những động từ trong câu dưới đây ở thì hiện tại hoàn thành 1. Bo _____ (drive) Rose to work today. 2. They _____ (work) all day and night. 3. We _____ (see) the new bridge. 4. He ____ (have) breakfast this morning. 5. Ann and Don ____ (wash) the car. 6. Kathy ____ (want) to go to Queensland for a long time. 7. Mel ____ (give) up smoking. 8. I ____ (forget) that man’s name. 9. They ____ (lose) their keys. 10. Jack ____ (be) to England. 11. They ____ (leave) London this month. 12. He ____ (bring) a lot of English papers. 13. She ____ (tell) me about it. 14. I ____ (get) a long letter from father this week. 15. She ____ (come), she will speak to you in a minute. 16. I ____ (be) to Radio City. 17. I think the director ____ (leave) the town. 18. I ___ (paint) my office. 19. We ____ (know) her since she arrived in our city. 20. I ____ (forget) your name.