write an essay about the reason, cause and solution of the shortage of teachers

write an essay about the reason, cause and solution of the shortest of teachers

Giải phương trình

\(tan^2x+cot^2x=\frac{4+sin4x}{sin^22x}\)

Cho tứ diện ABCD có M,N, G là trung điểm của AB, CD, MN

a, Tìm AG Ω (BCD) = G1

b, Chứng minh G1 là trọng tâm tgiac BCD

c, Gọi G2, G3, G4 là trọng tâm tg ACD, ABD, ABC

d, Tính \(\frac{AG}{AG1}\)

Cho A={1,2,4}

B={1,2,3,4,5,7}

Tìm X sao cho \(A\subset X\subset B\)

1. Cho biểu thức P=\(\left(\frac{\sqrt{a}}{\sqrt{ab}-b}-\frac{\sqrt{b}}{a-\sqrt{ab}}\right):\frac{a-b}{a\sqrt{b}+b\sqrt{a}}\) (với a>0,b>0, a#b)

a, Rút gọn biểu thức P

b, Tính số trị của biểu thức P khi biết a và b là 2 nghiệm của phương trình

\(x^2-8x+4=0\)

Write an essay about of 200 words, giving your opinions on the following problem.

" Although English has been taught in all the schools in our province for a long time, the learners' ability of using English is not up to our expectationd. As a teacher of English, you can give the basic causes and the solutions to this problem."

( Any pesonal information is not allowed to mention in your writing)

Use the following sets of words and phrases to write complete sentences

1. We must all put / pressure / authorities / if / we / want / something / do.

2. A short while ago / sister / help / me / carry / one bookcases / up / stairs.

3. Hardly / I / close / eyes / begin / imagine / most fantasic shapes.

4. He / not / plan / call / her / but / he / change / mind / last minute.

5. If / you / not / make / it / , please / drop me / line / ring me / office.

6. It / be / such / long time / I / last / see / him / I / not / sure / if / I / remember him.

7. She / such exceptional / ablilities / everyone / envious / her.

8. I / very impressed / all / work / you / do on your house.

9. spite / Mary's sadness / lose / contest / manage / smile.

10. world oceans / so vast / they / cope / present levels / pollution.

1 Tính

a, \(\sqrt{0,49.169.25}\)

b,\(\dfrac{\sqrt{63}}{\sqrt{112}}\)

c, \(\sqrt{\dfrac{27}{17}}.\sqrt{11.\dfrac{5}{17}}\)

d,\(\sqrt{\left(-5\right)^2.16.225}\)

e,\(\dfrac{\sqrt{2,5}}{\sqrt{1,6}}\)