HOC24
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Tìm các giá trị của tham số m để hàm số y = x 3 + 3 x 2 + m x + m : có y ' ≤ 0 trên một đoạn có độ dài bằng 1.
A. m = 9 4
B. m = 4 9
C. m = 2
D. m = 1 2
II. Read the passage carefully, then dicide if the statements are True (T) or Flase (F).
Lewis Carrol was the pen name of Charles Dogson, the writer who wrote a famous book for children, "Alice's Adventures in Wonderland". Charles Dodgson was born in England in 1832. When Charles finished school, he became a student at Oxford University. He studied mathematics and lateR he began to teach this subject at the university. Charles had no family, but he loved children very much. He often visited his friend, Henry George Liddell. Henry had three little girls and Charles liked Alice most. He often told her interesting stories about the adventures of a little girl in Wonderland. Alice likes these stories very much. When Alice Liddell was ten years old, she asked Charles to write down these stories for her. The name of the little girl in the stories was Alice, too. Then Charles decided to publish the book and took the pen name of Lewis Carroll.
He was born in England in 1835.
Tìm a để hàm số y = x 2 + 1 , x > 3 a . x + 4 , x ≤ 3 liên tục tai điểm x 0 = 3 ?
A. a = 1
B. a = 2
C. a = 4
D. a = 3
Đặt một đoạn dây dẫn có chiều dài 5 cm trong một từ trường đều có B = 0,4 T sao cho đoạn dây song song với các đường sức từ. Cho dòng điện có cường độ 0,75 A đi qua. Lực từ tác dụng lên đoạn dây đó bằng
A. 1,5 N
B. 0,03 N
C. 0 N
D. 0,015 N
Một hồ nước hình vuông cạnh 30cm. Chu vi hồ nước đó là:
A. 90cm
B. 120cm
C. 900cm
D. 60cm