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7 tháng 8 2024

He is supposed to have stolen that thing

6 tháng 8 2024

\(x+\left(\dfrac{2}{5}\right)^2=\dfrac{9}{10}\)

=>\(x+\dfrac{4}{25}=\dfrac{9}{10}\)

=>\(x=\dfrac{9}{10}-\dfrac{4}{25}=\dfrac{45}{50}-\dfrac{8}{50}=\dfrac{37}{50}\)

6 tháng 8 2024

`x + (2/5)^2 = 9/10`

`=> x + 4/25 = 9/10`

`=> x = 9/10 - 4/25`

`=> x = 45/50 - 8/50`

`=> x = 37/50`

-------------------------

`(x+2/5)^2 = 9/10`

`=> (x+2/5)^2 = (3/sqrt{10})^2`

`=> x + 2/5 = 3/sqrt{10}` hoặc `x + 2/5 = -3/sqrt{10}`

`=> x = 3/sqrt{10} - 2/5` hoặc `x = -3/sqrt{10} - 2/5`

`=> x = (-4+3sqrt{10})/10` hoặc `x = -(4+3sqrt{10})/10`

6 tháng 8 2024

a: Số học sinh trung bình là \(1200\cdot\dfrac{5}{8}=750\left(bạn\right)\)

Số học sinh khá là \(1200\cdot\dfrac{1}{3}=400\left(bạn\right)\)

Tổng số học sinh giỏi và yếu là 1200-750-400=50(bạn)

Số học sinh giỏi là 50:2=25(bạn)

Số học sinh yếu là 50-25=25(bạn)

b: Tỉ số phần trăm giữa số học sinh yếu và tổng số học sinh là:

\(\dfrac{25}{1200}=\dfrac{1}{48}\simeq2,08\%\)

6 tháng 8 2024

\(2x^3-1=15\)

=>\(2x^3=1+15=16\)

=>\(x^3=8\)

=>x=2

\(\dfrac{x+1}{6}=\dfrac{y-2}{3}=\dfrac{z+1}{4}\)

=>\(\dfrac{y-2}{3}=\dfrac{z+1}{4}=\dfrac{2+1}{6}=\dfrac{3}{6}=\dfrac{1}{2}\)

=>\(\left\{{}\begin{matrix}y-2=\dfrac{3}{2}\\z+1=2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=\dfrac{7}{2}\\z=1\end{matrix}\right.\)

Exercise 9. Circle the best answers. 1. You should eat a lot of fruits and vegetables because they _________ vitamin A, which is good for the eyes. A. run                    B. take                   C. provide(cung cấp)                   D. get 2. The health _________ from the diet expert is that you should eat less junk food and count your calories if you are becoming fat. A. advices               B. ideas       ...
Đọc tiếp

Exercise 9. Circle the best answers.

1. You should eat a lot of fruits and vegetables because they _________ vitamin A, which is good for the eyes.

A. run                    B. take                   C. provide(cung cấp)                   D. get

2. The health _________ from the diet expert is that you should eat less junk food and count your calories if you are becoming fat.

A. advices               B. ideas                  C. tip                     D. tips

3. The seafood I ate this morning makes me feel _________ all over.

A. itchy                   B. weak                  C. running               D. well

4. If you want to be fit, stay outdoors more and do more _________ activities.

A. physics               B. physic                 C. physical              D. physically

5. Do more exercise _________ eat more fruit and vegetables.

A. and                    B. so                      C. but                    D. or

6. After working on computers for long hours, you should _________ your eyes and relax.

A. wake                  B. rest                    C. sleep                  D. sleep in

7. Eat less high-fat food to keep you from _________ fat.

A. gaining               B. reducing             C. getting               D. rising

8. We should follow the advice from doctors and health _________ in order to keep fit.

A. managers            B. experts               C. people                D. workers

9. Have a healthy _________ and you can enjoy your life.

A. lifeline                B. lively                  C. lives                   D. lifestyle

10. They go _________ outside even when it’s cold.

A. swims                 B. swimming           C. swimming           D. swam

11. Rob eats a lot of fast food, and he _________ on a lot of weight.

A. spends                B. brings                 C. takes                  D. puts

12. We need to spend less time _________ computer games.

A. playing               B. to playing           C. play                    D. to play

13. To prevent the _________, you should eat a lot of garlic and keep your body warm.

A. cold                    B. mumps               C. flu                     D. headache

14. Be careful with _________ you eat and drink.

A. who                   B. this                    C. what                  D. that

15. Eating a lot of junk food may lead to your _________.

A. pain                   B. stomachache       C. obesity               D. fitness

16. My father does morning _________ every day.

A. running               B. well                    C. exercise              D. weak

17. Don’t eat that type of fish: you may have a/an _________.

A. energy                B. allergy                C. sick                    D. sore

18. Do you want to know how you can _________ healthy?

A. make                  B. have                   C. stay                    D. create

19. When you have a temperature, you should drink more water and rest _________.

A. most                  B. less                    C. few                    D. more

20. I forgot to wear a sun hat today, and I got a _________.

A. backache             B. headache            C. stomachache       D. earache

5
6 tháng 8 2024

1 provide

2 advices

3 itchy 

4 physical 

5 and 

6 rest 

7 reducing

8 people 

9 lifestyle

10 swimming

11 brings 

12 play 

13 flu

14 what 

15 obesity

16 exercise

17 allergy

18 stay

19 more

20 headache 

nếu có sai gì thì mong bạn thông cảm 

chúc bạn học giỏi

 

7 tháng 8 2024

1. You should eat a lot of fruits and vegetables because they _________ vitamin A, which is good for the eyes.

A. run                    B. take                   C. provide(cung cấp)                   D. get

2. The health _________ from the diet expert is that you should eat less junk food and count your calories if you are becoming fat.

A. advices               B. ideas                  C. tip                     D. tips

3. The seafood I ate this morning makes me feel _________ all over.

A. itchy                   B. weak                  C. running               D. well

4. If you want to be fit, stay outdoors more and do more _________ activities.

A. physics               B. physic                 C. physical              D. physically

5. Do more exercise _________ eat more fruit and vegetables.

A. and                    B. so                      C. but                    D. or

6 tháng 8 2024

help meee

 

6 tháng 8 2024

bạn có cần câu trả lời nữa không ạ?

#hoctot

6 tháng 8 2024

cho mình hỏi bạn còn cần câu trả lời không ạ?

#hoctot

12 tháng 8 2025

áp dụng tính chất của dãy tỉ số bằng nhau, ta được:

\(\frac{12x-15y}{7}=\frac{-12x+20z}{9}=\frac{15y-20z}{11}=\frac{12x-15y-12x+20z+15y-20z}{7+9+11}=0\)

=>\(\begin{cases}12x-15y=0\\ 20z-12x=0\\ 15y-20z=0\end{cases}\Rightarrow12x=15y=20z\)

=>\(\frac{12x}{60}=\frac{15y}{60}=\frac{20z}{60}\)

=>\(\frac{x}{5}=\frac{y}{4}=\frac{z}{3}\)

mà x+y+z=48

nên Áp dụng tính chất của dãy tỉ số bằng nhau, ta được:

\(\frac{x}{5}=\frac{y}{4}=\frac{z}{3}=\frac{x+y+z}{5+4+3}=\frac{48}{12}=4\)

=>\(\begin{cases}x=4\cdot5=20\\ y=4\cdot4=16\\ z=4\cdot3=12\end{cases}\)