user-avatar
maisukura
2 năm trước
cho tứ diện ABCD , diện tích tam giác ABC= 4 cm^2 , diện tích tam giấc SBD =6 cm^2, AB =3cm . góc giữa hai mặt phẳng ABC và ABD bằng 60 .tính thể tích ABCD
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

ai rảnh thì dịch bài th cũng đc nè~~~ V. Reading Comprehension Read the following passage and choose the best answers. Fuel When man first learned how to make a fire, he began to use fuel for the first time. The first fuel he used was probably wood Coal (56) Very widely as a source of energy until the last century. With the coming of the industrial revolution, it was soon realised that production (57) if coal was used instead of wood. Nowadays, many of the huge factories and electricity generating stations (58)_ to function if there were no coal. In the last twenty or thirty years. (59) the use of coal has declined. (60) , there have been changes in the coal industry. It is believed that more people (61) eoal if oil and gas were not so (62) available. There is more than (63) coal in the world for man's needs for the next two hundred years if our use of coal (64) Unfortunately, however, about half of the world's coal may never be used. Mining much of it would be very expensive (65) it was possible to use new equipment. 56. a. not used b. did not use c. not using d. was not used 57. a, doubles b. had doubled c. would double d. will double 58. a. were unable b, would be unable c. will be unable d. are unable 59. a. although b. however c. morcoverd . because 60. a. As a result b. But c. Though d. Nevertheless 61. a. use b. used c. will use d. would use 62. a. ready b. readily c. readiness d. unready 63. a. enough b. too C. SO d. much

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team