HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
Cho tích phân I = ∫ 0 π 4 x - 1 sin 2 x d x . Tìm đẳng thức đúng
A. I = - x - 1 cos 2 x 0 π 4 + ∫ 0 π 4 cos 2 x d x
B. I = - x - 1 c o s 2 x - ∫ 0 π 4 cos 2 x d x
C. I = - 1 2 x - 1 cos 2 x 0 π 4 + 1 2 ∫ 0 π 4 cos 2 x d x
D. I = - 1 2 x - 1 cos 2 x 0 π 4 - ∫ 0 π 4 cos 2 x d x
Cho tam giác ABC và điểm M thỏa mãn B M → = 2 C M → . F là một phép dời hình. Gọi A 1 = F A , B 1 = F B , C 1 = F C , M 1 = F M . Biết A B = 4 , B C = 5 , A C = 6 . Khi đó độ dài đoạn A 1 M 1 bằng:
A. 106
B. 138
C. 122
D. 38
Tìm tập xác định D của hàm số y = 2 - x 1 - 3 .
A. D = - ∞ ; + ∞
B. D = ( - ∞ ; 2 ]
C. D = ( - ∞ ; 2 )
D. D = ( 2 ; + ∞ )
Fill in each numbered blank with one suitable word or phrase.
Coping with loneliness is a very important skill of needed independent living skills for teens (1) _______ every teen has needed it. It doesn't matter (2)_______ they are going to college, starting a new (3) _______and moving into an apartment or getting married. Leaving your childhood home and being on your own for the first time will cause some (4) _______of loneliness. Teens who know how to recognize loneliness as the temporary feeling it is, use their support system and work through their loneliness have learned a valuable life skill and they do just fine. Those who cannot get over their loneliness may make wrong (5) _______ about where and how to live or (6) _______ to live with. We should recognize that being alone does not mean being lonely. Being (7) _______with ourselves is part of having a healthy (8)_______. Reading, drawing, crafting and listening to music are activities that we can enjoy by ourselves without feeling lonely. We should get involved in activities with our friends and activities we can help others. There are so many (9) _______ for us to connect with our family and friends, such as email, letter writing, online social networking, texting and (10) _______ phone calls.
Question 4:
A. position
B. situation
C. amount
D. level
Giải các phương trình sau x - 60 4 + x - 58 3 + x - 56 2 + x = 71
Để tách muối từ dung dịch nước muối người ta sử dụng phương pháp: ………………….. ………..Cứ 100ml dung dịch nước muối thì tách được 25g muối. Muốn thu được 125g muối người ta cần phải sử dụng …………. ml dung dịch nước muối.