x,y=3/4,1

dy/dx=2/3

TH1: \(x< \dfrac{1}{2}\)

Phương trình sẽ trở thành:

\(1-2x+5-2x=6\)

=>6-4x=6

=>4x=0

=>x=0(nhận)

TH2: \(\dfrac{1}{2}< =x< \dfrac{5}{2}\)

Phương trình sẽ trở thành:

\(2x-1+5-2x=6\)

=>4=6(vô lý)

=>\(x\in\varnothing\)

TH3: \(x>=\dfrac{5}{2}\)

Phương trình sẽ trở thành:

2x-1+2x-5=6

=>4x=12

=>x=3(nhận)

|\(x\) + 7| = 2

\(\left[\begin{array}{l}x+7=-2\\ x+7=2\end{array}\right.\)

\(\left[\begin{array}{l}x=-2-7\\ x=2-7\end{array}\right.\)

\(\left[\begin{array}{l}x=-9\\ x=-5\end{array}\right.\)

Vậy \(x\in\left(-9;-5\right)\)

Nếu \(x=-9\) thay vào biểu thức C = \(-\frac57x^2-\frac34x+1\) ta có:

C = - \(\frac57\left(-9\right)^2\) - \(\frac43\left(-9\right)\) + 1

C = - \(\frac57.81+12\) + 1

C = \(-\frac{405}{7}\) + \(\frac{84}{7}+\frac77\)

C = - \(\frac{321}{7}+\frac77\)

C = \(\) - \(\frac{314}{7}\)

Nếu \(x=-5\) thay vào biểu thức C = \(-\frac57x^2-\frac{4}{3x}+1\) ta có:

C = - \(\frac57.\left(-5\right)^2-\frac43.\left(-5\right)+1\)

C = - \(\frac57.25+\frac{20}{3}+1\)

C = \(-\frac{125}{7}+\frac{20}{3}+1\)

C = \(-\frac{375}{21}+\frac{140}{21}+\frac{21}{21}\)

C = - \(\frac{235}{21}+\frac{21}{21}\)

C = - \(\frac{214}{21}\)

1 How do most of your classmates go to school?

2 How far is it from your house to the nearest town?

3 What are the students learning in the schoolyard?

4 When are there often traffic jams in the city center?

5 How does Trung usually ride his motorbike?

6 What did your father use to do?

VII

1 It is over 100 km from my hometown in HCM city

2 It is about 25km from my grandparents' house

3 I used to ride a small bike in the yard outside the flat

4 There used to be a bus station in the city center but it was moved to the suburbs

5 Children must learn road safety before being allowed to ride on the road

Olm chào em, cảm ơn đánh giá của em về chất lượng bài giảng của Olm, cảm ơn em đã đồng hành cùng Olm trên hành trình tri thức. Chúc em học tập hiệu quả và vui vẻ cùng Olm em nhé!

1 - You must not park here
2 - May I use your phone
3 - You must finish your homework
4 - You should exercise regularly
5 - She does not have to come to the meeting
6 - You must not touch the exhibits
7 - Students must wear a uniform
8 - We do not have to stay late
9 - You should not eat junk food every day
10 - You must carry an ID card
11 - He must be at the airport by 7 AM
12 - She can dance very well
13 - You should review your notes before the exam
14 - You must not smoke in the library
15 - May I borrow your book
16 - They cannot do this difficult exercise
17 - You should not spend too much time playing video games
18 - You must fasten your seatbelt while driving
19 - May I take your car in the afternoon today
20 - You must not park your car here

1. It's against the rules to park here.

- You .....mustn't park here............

2. Is it OK if I use your phone?

- .......Can I use your phone?.......................

3. It's necessary for you to finish your homework.

- You .......need to finish your homework................

4. It's a good idea to exercise regularly.

- You ...should exercise regularly..........................

5. It's not necessary for her to come to the meeting.

- She .doesn't have to come to the meeting......................................

6. It's forbidden to touch the exhibits.

- You mustn't touch the exhibits ........................................

7. It's the rule to wear a uniform.

- Students ......must wear a uniform..............................

8. It's not necessary for us to stay late

- We don't have to stay late......................

9. It's a bad idea to eat junk food every day.

- You ....shouldn't eat junk food every day.......................

10. It's the rule to carry an ID card.

- You ......must carry an ID card..............................

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Thế à 🤔🤔🤔

Hẹn Ngày Xem Gái >:)

cánh diều hay kết nối tri thức??

Hình ảnh so sánh: “Tôi quên thế nào được những cảm giác trong sáng ấy nảy nở trong lòng tôi như mấy cánh hoa tươi mỉm cười giữa bầu trời quang Ý nghĩ thoáng qua ấy trong trí óc tôi nhẹ nhàng như một làn mây lướt ngang trên ngọn núi Trước mắt tôi trường Mĩ Lý vừa xinh xắn vừa oai nghiêm như cái đình làng Hòa Ấp” - Những hình ảnh so sánh giúp cụ thể hóa cảm xúc bâng khuâng, bồi hồi của nhân vật tôi ngày đầu đến lớp. Làm bài văn giàu hình ảnh và sinh động hơn.

= 11/ 5 (− 3/7 − 5/7 ​ )+ (−8/7) ​ ⋅ 6/11

= −8/7 ( 5/11 + 6/11)

​=-8/7 ​

5/11 x (-3/7) + (-5/7) + (-8/7) x 6/11 = (-15/77) + (-5/7) +(-48/77) = ( -9/11) + (- 5/7) = ( - 118/77)

Của bạn đây "/" này là dấu phân số nhé