\(\dfrac{3\sqrt{2}-2}{3-\sqrt{2}}\)-\(\dfrac{2+3\sqrt{2}}{\sqrt{2}}\)

1.   Every time I fly to the United States, I get really bad                  .

      a. asthma                     b. jet lag                      c. confusion                 d. recreation

2.   Leave the ironing                          - I’ll do it later.

      a. for the time being    b. from time to time    c. in any time              d. in the nick of time

3.   These factors contribute                           making city life more difficult for its residents.

      a. in                             b. with                         c.to                              d. on

4.   Tower blocks from the 60s and 70s could be                   after Grenfell Tower fire.

      a. got down                 b. let down                  c. turned down            d. pulled down

5.   The trip to the National Gallery has been until next Friday.

      a. put off                     b. looked into              c. turned up                 d. found out

6.   The street food in Hoi An is delicious and                       .

      a. available                  b. fabulous                  c. affordable                d. fascinating

7.   “Thanks for giving me a ride to work today.”

      “                I was heading this direction anyway.”

      a. You don’t need to.  b. Yes, thanks.            c. No worries.              d. I’d love to.

8.   “                ?” “Everything is fine. How about you?”

      a. How old are you?                                        b. How’s it going?

      c. What’s your life?                                        d- What’s the matter?

9.   Life in Ho Chi Minh City is                      than we thought at first.

      a. far the busier           b. the more busier       c. much more busy      d. much busier

10. Of the cities we surveyed, Singapore was            the worst rated by its residents for culture.

     a. a bit                           b. a lot                         c. much                        d.by far

Cho tam giác ABC vuông tại A, đường cao AH
1) Tính AB, AC, AH khi HB= 4 cm, HC=9 cm.
2) Gọi D, E lần lượt là hình chiếu của H trên AB, AC. Chứng minh rằng DE² = HB.HC
3) Chứng minh rằng AE.AC=AD.AB
4) Chứng minh rằng BD.BA + AE.AC=AB²
5) Chứng minh rằng Δ AED và Δ ABC đồng dạng
6) Kẻ trung tuyến AM. Chứng minh rằng AM ⊥ DE

Cho tam giác ABC có A = 90 độ , kẻ đường cao AH và trung tuyến AM kẻ HD vuông góc AB , HE vuông góc AC
biết HB = 4,5cm; HC=8cm.
a) Chứng minh BAH = MAC
b) Chứng minh AM vuông góc DE tại K
c) Tính độ dài AK

Cho tam giác nhọn DEF . Đường cao EN giao điểm KN tại Q . Chứng mình tam giác DNE đồng dạng DMK

GIÚP TUI ZỚI :((