1 was crying

2 started

3 was ẹnjoying

4 hurried

5 had left

6 punched

7 had tried

8 had happened 

Ex1:

1 cognition

2 blueberries

3 decline

Ex2:

4 memory

5 word

6. 70

7 attention

8 tests

9 episodic

Bạn xem lại nha, \(3d^94s^1\)là cấu hình ko bền,rất khó tồn tại, nhóm IB có 1 cấu hình gần tương tự của \(Cu:\left[Ar\right]3d^{10}4s^1\):cấu hình này có số e hoá trị là 1 (do phân lớp sát ngoài cùng đã bảo hoà) + với đây là nguyên tố d nên thuộc lớp \(IB\) là hợp lí nè

-Còn \(\left[Ar\right]3d^84s^2\) có số e hoá trị là 10 (2 từ lớp ngoài cùng + 8 từ phân lớp sát ngoài cùng chưa bão hoà) thêm với đây là nguyên tố d 

=> NHóm \(VIIIB\) là hoàn toàn hợp lí nhé

\(\Delta ANC\) có:

\(tan30=\dfrac{AN}{NC}\\ < =>AN=tan30.NC\left(1\right)\)

\(\Delta BNAcó:\)

\(tan45=\dfrac{AN}{BN}\\ < =>AN=tan45.BN\left(2\right)\)

\(\left(1\right)\left(2\right)=>tan30.NC=tan45.BN\)

Đặt \(NC=x==>BN=16-x\)

Thế vào PT ta có: \(tan30.x=tan45.\left(16-x\right)\\ < =>\dfrac{\sqrt{3}x}{3}=16-x\)

Giải PT ta được \(x=NC\approx10,1435\left(cm\right)\\ =>AN=tan30.NC=\dfrac{\sqrt{3}}{3}.10,1435=5,86\left(cm\right)\)

B

C

B

B

B

A

A

1 Young people suffer from stress because they try to please everyone by taking on too many tasks. This makes it harder to balance homework, parties, sports activities, and friendships.

2 No, caffeine is not only in the form of coffee ,it is also found in soft drinks.

3 Physical exercise increases certain chemicals in the brain that help to calm you down

4 Getting enough sleep helps to avoid stress and keeps you healthy and full of energy

5 you need to sit down quietly and breathe deeply for twenty minutes to help calm down and gain perspective.

Ex1:

1 It can be challenging to focus on studying when notifications from social media platforms keep distracting me.

2 It's important to prioritize tasks and concentrate on one thing at a time to maximize productivity

 3 I find it helpful to set aside dedicated time slots for browsing social media so that it doesn't interfere with my ability to focus on other aspects of my life

4 Social media platforms often use various strategies to grab our attention and keep us engaged, making it difficult to concentrate

5 Teen social media addiction is a growing concern in today's digital age, where individuals are constantly connected to their smartphones and the internet

Ex2:

1 My best friend is studying abroad, so it is impossible for us to meet each other now

2 They are going to build a new bridge across this river, so traveling will be much more convenient.

3 It has been ages since our last encounter, but I still remember him clearly.

4 I went down with the flu last week, so I had to postpone my work

I think the festival will be full of fun, and many people will enjoy it

\(CO_2+2H_2O--->\left(CH_2O\right)_n+H_2O+O_2\)

Độ dài nửa quảng đường: \(s_1=s_2=\dfrac{s}{2}=\dfrac{140}{2}=70\left(km\right)\)

Thời gian ô tô đi:

Nửa QĐ đầu: \(t_1=\dfrac{s_1}{v_1}=\dfrac{70}{50}=1,4\left(h\right)\)

Nửa QĐ sau: \(t_2=\dfrac{s_2}{v_s}=\dfrac{70}{70}=1\left(h\right)\)

Thời gian ô tô đi cả QĐ: \(t'=t_1+t_2=1+1,4=2,4\left(h\right)\)

Vận tốc TB trên cả quãng đường:

\(v_{TB}=\dfrac{s_1+s_2}{t_1+t_2}=\dfrac{140}{2,4}\approx58,3\left(km/h\right)\)