Tính diện tích xung quanh của một hình lăng trụ đứng tam giác ABCA'B'C' có đáy là tam giác ABC vuông tại A AB=3cm AC=4cm AA'=5cm

Thì hiện tại đơn được sử dụng để làm gì?

làm hộ em bài 3 4 5 đi ạ . làm đc bài nào thì làm 😢😢😢

Các chuyên gia giải toán và các bạn học sinh giỏi vào giúp mình giải bài toán này với ạ, mình cần gấp, làm ơn giúp mình nhanh ạ

hộ em

bài 1 tính tổng dãy số cách đều sau a) D = 1+2+3+.....+47+48+49 b) E = 5 + 10 + 15 + ..... + 185 + 190 + 195 làm theo 4 bước bước 1 : Tính số các số hạng b2 : tính giá trị 1 cặp b3 : tính số cặp b4 : tính giá trị của tổng ko làm tắt làm như bài mẫu BÀI MẪU VD1 : B = 1+3+5+7+9+...+99 số các số hạng là : ( 99 - 1 ) : 2 + 1 = 50 ( số hạng )' giá trị của 1 cặp là : 1 + 99 = 100 số cặp là : 50 : 2 = 25 căp giá trị của tổng là : 100 x 25 = 2500

Kể lại truyền thuyết Con rồng cháu tiên Hăm chép mạng nha mọi ngừi. Cảm mơn nhìuuuuuu

Viết ngày tháng. 1. The first of January 2. The nineteenth of September 3. The second of May 4. The twenty-fifty of October 5. The thirty-first of July 6. The twelfth of December 7. The eighth of February

mình hơi dở môn Anh , mn giúp mình với ạ

II Choose the best answer : 11 They said that they had been driving throught the desert _____ A The previous day B yesterday C the last day D Sunday previously 12 He asked the chidren _____ too much noise A not to make B not making C don't make D if they don't make 13 The man said that money ______ the passport to everything A will be B is C was D can be 14 The teach said Columbus ______ America in 1942 A discovered B had discovered C was discovering D would discover 15 John said he ______ her since they ______ school A hasn't met- left B hadn't met - had left C hadn't met left D didin't met - has left 16 The woman asked _____ get luch at school A can the children B whether the children could C if the children D could the children 17 Laura said thet when she _______ to school, she saw an accident A was walking B has walked C had been walking D has been walking 18 He asked, '' Why didn't she take the final exam?'' - He asked Why _____ the final exam A she took B did she take C she hadn't taken D she had taken 19 Ba said he ______ some good marks the semester before A gets B got C had gotten D have got 20 They told their parents that they _____ their best to do the test A try B will try C are trying D would try 21 She asked me where I ______ from A come B coming C to come D came 22 She ______ me whether I like classical music or not A ask B asks C asked D asking 23 He asked me who _____ the editor of that book A was B were C is D has been 24 He wants to know wether I _____ back tomorrow A come B came C will come D would come 25 I wonder why he _____ love his family A doesn't B don't C didn't D hasn't 26 They asked me how many children _________ A if I had B had I C I had D have I GIẢI GIÙM TUI TUI ĐANG CẦN GẤP KO ĐC LM SAI HAY SAO CHÉP NHỚ GIẢI THÍCH GIÙM TUI TẠI SAI BẠN CHỌN ĐÁP ÁN ĐÓ NHA XIN CẢM ƠN