1. I usually keep in contact with my friends and family by texting and making video calls on social media apps. It helps me feel close to them even when we are far away.

2. Technology helps me study by giving me access to online lessons, videos, and useful information. I can also use apps to practice and improve my skills.

3. I find Mars the most interesting because scientists believe it may have had water in the past, and people are studying it for future exploration.

4. I usually search for study materials, interesting facts, music, and sometimes entertainment like videos or games.

5. When my smartphone stops working, I try to restart it first. If it still doesn’t work, I ask someone for help or take it to a repair shop.

1. I usually keep in contact with my friends or family living far away by using video calls, social media, and messaging apps.

2. Technology helps me study by giving access to online lessons, digital libraries, and useful tools like language apps or educational videos.

3. I find Mars the most interesting because scientists believe it may have once had water and could possibly support human life in the future.

4. I usually search for information related to schoolwork, news, entertainment, and sometimes tutorials to learn new skills.

5. When my smartphone stops working, I try restarting it first, and if that doesn’t help, I take it to a repair shop or use another device temporarily.

chắc có

Có nha bn

Giải:

Gọi thời gian vòi một chảy một mình đầy bể là t (giờ)

Thì mỗi giờ vòi một chảy một mình được:

1 : t = 1/t (bể)

Mỗi giờ vòi hai chảy được:

1/t : 2/3 = 3/2t (bể)

Cả hai vòi cùng chảy mỗi giờ chảy được:

1 : 6 = 2/6 (bể)

Theo bài ra ta có:

1/t + 3/2 t = 1/6

(1/1 + 3/2)x 1/t = 1/6

5/2 x 1/t = 1/6

1/t = 1/6 : 5/2

1/t = 1/15

t = 15

Mỗi giờ vòi hai chảy được:

1/6 - 1/15 = 1/10

Vòi hai chảy đầy bể sau:

1 : 1/10 = 10 (giờ)

Kết luận:..

x^2 + 1 - 3

= x^2 + (1 - 3)

= x^2 - 2

ko biết :)

là ngày 6/4 :))