cho hệ phương trình mx - y = 2 và 3x + my = 5 tìm m để hệ phương trình có nghiệm duy nhất

làm hộ toii từ 1-7 trừ câu 3,4 nhaaaa:>

Giải bất phương trình: giúp mk câu d với ạ

Em hãy nhận xét về tình hình nước ta sau hiệp ước nhâm tuất(1862)

câu 3 phân 1 trong bài sông nước cà mau

Tính tổng: a, B=-1 ²+2 ²-3 ²+4 ²-...-19 ²+20 ² b, D=1 ²+3 ²+5 ²+...+99 ² c, E=11 ²+13 ²+15 ²+...+199 ²

mình muốn hỏi câu k bài 3 và bài 4;5;6

C.Give the correct form of the verbs in brackets to complete the following sentences 1.No one enjoy (go).....to hospital. 2.What you (do)......at the moment? I (watch)....TV. 3.We (be).....students in four years. 4.A new school (build)......near our school now. 5.You (be)......angry if he refuses to help you? 6.I will send him the message as soon as he (return)...... 7.Alttle girl can't spend all her time (listen).......to stories. 8.He sent a telegram for his mother (learn)......good new. 9.Where are you? I am upstairs.I (have).........a bath. D.Fill in each blank with the correct form of the word given in capital: 1.My Father has a.........computer.He often brings it with him when he's away on business.(PORT) 2.We are all........about going on an excursion to Cuc Phuong forest next weekend.(EXCITE) 3.The room will look brighter if there is a.......on the wall.(PAINT) 4.Some of the children.....boys,play marbles when there is a break.(MAIN) 5.You shouldn't eat.......food.(HEALTH) 6.We mustn't be.........when we cross busy streets.(CARE) 7.She often feels..........when she gets bad marks.(HAPPY) 8.There are about 200.........in this company.(EMPLOY) 9.Mai is.........at math than me.(GOOD) 10.This lovely apartment has two bedrooms and it is........(FURNISH) E.Use given words to rewrite the second sentence that the meaning not change: 1.What a luxurious car! How.........................................................................................................! 2.It takes me an hour to do my homework every evening. I spend..................................................................................................... 3.No one can run faster than me. I am.......................................................................................................... 4.Is there a library at your school? Does........................................................................................................? 5.How old are you? What.........................................................................................................? 6.Shall I brings you a cup of tea? Would.......................................................................................................? 7.My sister is more hard-working than me. I don't........................................................................................................? 8.Do you have a better refrigerator than this? Is this.......................................................................................................... 9.Finding an apartment in a big city is not easy. It is.............................................................................................................. 10.February often has 28 days. There..........................................................................................................

Một nhà máy điện phát ra công suất điện P=100MW. Hiệu điện thế ở đầu đường dây tài điện là U=25000V. Điện trở tổng cộng của đường dây dẫn điện là 5ohm. Tính công suất hao phí trên đường dây tải điện

dot chay 21,16 g Al. Tinh the tich oxi va the tich khong khi can dung o dktc