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8 tháng 7 2021

refer

Cho tam giác ABC vuông tại A.vẽ AH vuông góc với BC tại H.Sao cho:\(BC^2=2AH^2+BH^{^{2^{ }}}+CH^2\) - Hoc24

3 tháng 4 2021

\(xy-2x+y+1=0\\ x\left(y-2\right)+\left(y-2\right)=-3\\ \left(x+1\right)\left(y-2\right)=-3\)

Lập bảng

x+113-1-3
y-231-3-1
x02-2-4
y53-11

Vậy \(\left(x;y\right)\in\left\{\left(0;5\right);\left(2;3\right);\left(-2;-1\right);\left(-4;1\right)\right\}\)

3 tháng 4 2021

xy−2x+y+1=0x(y−2)+(y−2)=−3(x+1)(y−2)=−3xy−2x+y+1=0x(y−2)+(y−2)=−3(x+1)(y−2)=−3

Lập bảng

x+113-1-3
y-231-3-1
x02-2-4
y53-11

Vậy (x;y)∈{(0;5);(2;3);(−2;−1);(−4;1)}

7 tháng 5 2021

jimmmmmmmmmmmmmmmmmmmmmmmmmmm

5 tháng 12 2021

\(R_{tđ}=\dfrac{R_1\cdot R_2}{R_1+R_2}=\dfrac{24\cdot12}{24+12}=8\Omega\)

\(I=\dfrac{U}{R}=\dfrac{12}{8}=1,5A\)

\(P=\dfrac{U^2}{R}=\dfrac{12^2}{8}=18W\)

\(Q_{tỏa1}=A_1=U_1\cdot I_1\cdot t=12\cdot\dfrac{12}{24}\cdot1\cdot3600=21600J\)

\(Q_{tỏa2}=A_2=U_2\cdot I_2\cdot t=12\cdot\dfrac{12}{12}\cdot1\cdot3600=43200J\)

5 tháng 12 2021

Bạn có thể giúp mình làm luôn câu c, d được không ạ

 

15 tháng 9

không làm mà đòi có ăn thì ăn chubin nhé

 

Giúp mình với mng ơi ❗❕❗III. Put the verbs in brackets in the passive future simple.1. Jim (visit) _________________________ by Jane tomorrow.2. _________________________ (this car/ wash) by my father tomorrow?3. In the next few days, breakfast (prepare) ________________________by my sister.4. Jim's cat (feed) _________________________ by Jane when he's away from home.5. Mr. Smith's wedding cake (not buy) _____________________________ in the localbakery.6. _________________________ our...
Đọc tiếp

Giúp mình với mng ơi ❗❕❗

III. Put the verbs in brackets in the passive future simple.
1. Jim (visit) _________________________ by Jane tomorrow.
2. _________________________ (this car/ wash) by my father tomorrow?
3. In the next few days, breakfast (prepare) ________________________by my sister.
4. Jim's cat (feed) _________________________ by Jane when he's away from home.
5. Mr. Smith's wedding cake (not buy) _____________________________ in the local
bakery.
6. _________________________ our plan/ develop) into a big project?
7. The equipment you need (sell) _______________________ at that store tomorrow.
8. All the housework (do) _________________________ by the new housemaid.
9. Our project on energy saving (complete) _________________________ by the end of
this month.
10. I don't think traditional books (replace) _________________________ by e-books.
11. The project on new sources of power (invest) _________________________ by a group
of environmentalists.
12. All the students (instruct) _________________________ to use the new equipment by
the teacher.
13. When _________________________ (a new bridge/ build) across this river?
14. Jim's essay (read) ________________ out loud in front of the whole class tomorrow.
15. The laundry (do) _________________________ by me tomorrow morning

16. A new shop (open) ________________________at the end of the street tomorrow.
17. The report (write) _________________________ by the group leader.
18. Who (pick up) _________________________ by Peter tonight?
19. This car (drive) _______________________ by me after my father gives me this.
20. My cat (take) _________________________ to the vet's by my mother.

3
7 tháng 1 2022

1. will be visited

2. Will this car be washed

3. will be prepared

4. will be fed

5. won’t be bought

6. Will our plan be developed

7. will be sold

8. will be done

9. will be completed

10. will be replaced

11. will be invested

12. will be instructed

13. will a new bridge be built

14. will be read

15. will be done

16. will be opened

17. will be written

18. will be picked up

19. will be driven

20. will be taken

7 tháng 1 2022

nhiều thế e =))

Bài 1: 

a: =5(x+2y)

b: =(x+y)(5x-7)

Bài 2: 

a: \(=\dfrac{1+2}{xy}=\dfrac{3}{xy}\)