Một electron bay dọc theo hướng đường sức của điện trường đều với vận tốc tại A là 5 . 10 6 , sau đó dừng lại tại B với AB=d=10cm (A, B đều nằm trong điện trường). Độ lớn của cường độ điện trường E?

A. 7109,4 V/m

B. 355,47 V/m

C. 170,9 V/m

D. 710,94 V/m

cho sơ đồ chuyển hóa: Glucozo → l e n   m e n   r u o u  X  → Y  → Z → + X  T. T là:

A. C H 3 C O O H .

B. C H 3 C H 2 O H .

C. C H 3 C O O C 2 H 5 .

D. C H 3 C H ( O H ) C O O H .

\(\left(x^2+2x-2\right)^2+2\left(x^2+2x-2\right)=x+2\)

\(\Leftrightarrow\left(x^2+2x-2\right)^2+2\left(x^2+2x-2\right)+1=x+3\)

\(\Leftrightarrow\left(x^2+2x-2+1\right)^2=x+3\)

\(\Leftrightarrow\left(x^2+2x-1\right)^2=x+3\)

\(\Leftrightarrow\left|x^2+2x-1\right|=x+3\)

\(\Leftrightarrow\left[{}\begin{matrix}x^2+2x-1=x+3\\x^2+2x-1=-x-3\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x^2+x-4=0\\x^2+3x+2=0\end{matrix}\right.\)

.........giải từng phương trình ra theo công thức\(\Delta\)

=> nghiệm của phương trình..........

Nghiệm âm lớn nhất của phương trình 2 tan 2 x + 5 tanx + 3 = 0 là

A. − 5 π 6

B.  − π 3

C.  − π 6

D.  − π 4

Fill in each numbered blank with one suitable word or phrase.

Visiting Special Schools In Ho Chi Minh City

For disabled children, special education and care is an essential need.  A special school may not be spacious, but it will become their second homes and families, helping unfortunate children to (1) _______  knowledge and skills as well as self-confidence in order to (2) _______ better into the community.

The Future School, a semi-boarding school, now has 40 handicapped children, from ages 6 to 16. The principal of Future School said, “Most of the students here have difficulties with language and life skills. So I (3) _______ great importance to improving their life skills and developing their language skills as much as possible.

Ms. Thu Huong, who has worked in the school for a many years, is also interested in teaching life skills to students. I (4)  _______  them with my heart and try to develop suitable learning programmes for them. Teaching them is very difficult because of the (5) _______ between school and family. So, I always recommend families help students review what I taught during the day, so that the day after we can receive the students’ (6) _______  from home about the lessons”, said she.

The Glow Blind Center has been (7) _______  for 29 years to teach and care (8) ______ the blind.  About 30 blind students have been sponsored by the center, most of them from difficult backgrounds. Every morning, the center’s Sisters (9) _______children to Nguyen Dinh Chieu School, a special school for the handicapped, and pick them up in the afternoon for after-school help and to feed them. (10) _______  they are not blind themselves, the Sisters all want to learn Braille to be closer to their children.

Question 2:

A. integrate

B. combine

C. mix

D. suit