Cho ΔABC vuông tại A, đường cao AH

a) Biết AB=5cm, BH=3cm, Tính BC,CH,AH

b)Nếu AB',AC'=3:4 và BC=10cm. Tính AB

Help mới mình với ạ (❁´◡`❁)

Giúp mình với !! Đưa thừa số ra ngoài dấu căn !

a) √7x^2 với x>0

b)√8y^2 với y<0

c)2√25x^3

d)√48y^4

1. What ……does……….. your father ……do……….. (do)?

    - He ………works………. (work) as a teacher at Nguyen Du Primary School.

    How ……does……….. he …………travel…… (travel) to work?

    - He ……goes………... (go) to work by motorbike.

    When ……does……… he ……work………… (work) at school?

    - He ……works……….. (work) from Monday to Friday.

    Which subject ………does……... he …………teach……. (teach)?

    - He ………teaches…….. (teach) English.

2. …Does………… your grandmother ……plant……….. (plant) trees in her garden?

- No, she ……doesn't………. (not). She …………doesn't like…………… (not/like) trees. She ……plants…………. (plant) flowers.

3. ………Does…….. your class ………have…….. (have) twenty-five students?

- No, it ……doesn't…………. (not). My class …has………. (have) thirty students.

4. My brother ……doesn't get up……………… (not/ get up) at 6 every morning. He always ……goes……. (go) to school late.

5. Nam’s family ……doesn't have…………… (not/have) a big breakfast. They usually ………eat….. (eat) a loaf of bread with fried eggs and ……drink……… (drink) milk.

6. How much beef …does……… she ……want……. (want)?

- She ……wants……….. (want) 200 grams.

7. Nam ………doesn't stay…………. (not like/stay) at home on the weekends. He and his friends usually ……go… (go) out and …play………… (play) sports together.

8. ……Does…….. your sister …go……….. (go) to the cinema every weekend?

- No, she …doesn't………… (not). She usually ……stays…….. (stay) at home and ………. (do) housework to help her mother.

9. How often ………do…… Nam and his friends ……go………. (go) camping?

- They ……go…… (go) camping once a month.

    What …do……… they always ……wear…….. (wear) when they go camping?

- They always …wear……… (wear) strong boots and warm clothes.

10. What ……does……… Minh ……do…….. (do) in his free time?

- He often …plays………. (play) sports. Sometimes, he …listens……….. (listen) to music or ………plays……... (play) video games.

Giúp mình với ạ !

Cho mạch điện biết R₁=2Ω,R2=3Ω,R3=4Ω,R4=6Ω,U_AB=18V

a)Tính điện trở tương đương của đoạn mạch

b)Tính cđdđ qua các điện trở

1. won't be

2. will do

3. won't go

4. will be

5. playing

6. made

7. is not

8. will win

6. c

7. a

8. b

chúc em học tốt !