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1 tháng 12 2021

\(\left|31-17\right|-\left|13-57\right|=\left|14\right|-\left|-44\right|=14-44=-30\)

1 tháng 12 2021

-44 oqr đâu đấy ạ 

\(A=\dfrac{13^{15}+1}{13^{16}+1}\)

\(\Leftrightarrow13A=\dfrac{13^{16}+13}{13^{16}+1}=1+\dfrac{12}{13^{16}+1}\)

\(B=\dfrac{13^{16}+1}{13^{17}+1}\)

\(\Leftrightarrow13B=\dfrac{13^{17}+13}{13^{17}+1}=1+\dfrac{12}{13^{17}+1}\)

mà \(13^{16}+1< 13^{17}+1\)

nên A>B

25 tháng 12 2017

a)15.12-3.5.10

cách 1:

15.12-3.5.10= 15. 12- 15. 10

= 15.( 12-10)= 15.2= 30

cách 2:

15.12-3.5.10= 3.5 .12 -3.5.10= 3.(5.12- 5.10)= 3.( 60-50)

=3.10=30

15 tháng 1 2019

a) Cách 1: 15.12 - 3.5.10 = 180 - 150

= 30

Cách 2 : 15.12 - 3.5.10 = 15.12 - ( 3.5 ) .10

= 15.12 - 15.10

= 15. ( 12 - 10 )

= 15.2

= 30

b) Cách 1 : 45 - 9.( 13 + 5 ) = 45 - 9.18

= 45 - 162

= -117

Cách 2 : 45 - 9.( 13+ 5 ) = 9.5 - 9.18

= 9.( 5 - 18 )

= 9. ( -13 )

= -117

c) Cách 1 : 29.( 19 - 13 ) - 19.( 29 - 13 ) = 29.6 - 19.16

= 174 - 304

= -130

Cách 2 : 29.( 19 - 13 ) - 19.( 29 - 13 )

= 29.19 - 29.13 - 19.29 + 19.13

= 19.13 - 29.13

= ( 19 - 29 ).13

= (-10) .13

= -130

5 tháng 8 2016

16.19

=16.(20-1)

=320-16

=304

46.99

=46.(100-1)

=4600-46

=4554

35.98

=35.(100-2)

=3500-70

=3430

5 tháng 8 2016

16.(20-1)=320-16=304

46.(100-1)=4600-46=4554

35.(100-2)=3500-70=3430

3 tháng 2 2020

a) 15 . 12 - 3 . 5 .10

= 15 . 12 - 15 . 10

= 15 ( 12 - 10)

= 15 . 2

= 30

b) 45 - 9 . ( 13 + 5 )

= 9 . 5 - 9. ( 13 + 5)

= 9 . [ 5 - ( 13 + 5)]

= 9 . [5 - 13 -5 ]

= 9 . (-13)

= -117

c) 29 . ( 19 - 13 ) - 19 . ( 29 - 13 )

= 29 . 19 - 29 . 13 - 19 . 29 + 19 . 13

= 29 . 13 - 19 . 13

= - 13. ( 29 -19 )

= - 13. 10

= - 130

~ Học tốt

# Chiyuki Fujito

3 tháng 2 2020

a) 15.12-3.5.10

= 15.12-15.10

= 15.(12-10)

= 15.2

= 30

b) 45-9.(13+5)

= 45-9.18

= 45-162

= -117

c) 29.(19-13)-19.(29-13)

= 29.6-19.16

= 174-304

= -130

13. I enjoy listening to pop music best.à  Pop music is my ……………………………14. They didn’t go camping yesterday because it rained heavily.- It ………………………………15. I started playing soccer 5 years ago.à I have................................16.Jack is 13 years old and my son is,too.à Jack is ………………17. Mary was sick, so she could not go to school.→ Because  ………………………18. The last time I met him was 3 years ago→ I haven’t ……………………………….19. Lan went out because she finished her homework.(so)→ Lan ...
Đọc tiếp

13. I enjoy listening to pop music best.

à  Pop music is my ……………………………

14. They didn’t go camping yesterday because it rained heavily.

- It ………………………………

15. I started playing soccer 5 years ago.

à I have................................

16.Jack is 13 years old and my son is,too.

à Jack is ………………

17. Mary was sick, so she could not go to school.

→ Because  ………………………

18. The last time I met him was 3 years ago

→ I haven’t ……………………………….

19. Lan went out because she finished her homework.(so)

→ Lan  ………………………………………

20. He is interested in doing morning exercise.

→ He enjoys ……………………………………………

21. We have learned English for 3 years.

→ We started ……………………………………

22. We started to live here in 2012.

→ We have ......................................................

23. Her book is not the same as mine.

→ Her book is..........................................

24. You should walk around the Old Quarter at night.

→ It’s a good idea to.....................................

3
30 tháng 11 2021

13. I enjoy listening to pop music best.

à  Pop music is my ……favorite kind of music………………………

14. They didn’t go camping yesterday because it rained heavily.

- It ……rained heavily so they didn't go camping yesterday…………………………

15. I started playing soccer 5 years ago.

à I have.......played soccer for 5 years.........................

16.Jack is 13 years old and my son is,too.

à Jack is ……the same age as my son…………

17. Mary was sick, so she could not go to school.

→ Because  ………Mary was sick, she could not go to school………………

18. The last time I met him was 3 years ago

→ I haven’t ………met him for 3 years……………………….

19. Lan went out because she finished her homework.(so)

→ Lan  …had finished her homework so she went out……………………………………

20. He is interested in doing morning exercise.

→ He enjoys ……doing morning exercise.………………………………………

21. We have learned English for 3 years.

→ We started ……learning E 3 years ago………………………………

22. We started to live here in 2012.

→ We have ........lived here since 2012..............................................

23. Her book is not the same as mine.

→ Her book is......different from mine....................................

24. You should walk around the Old Quarter at night.

→ It’s a good idea to.......... walk around the Old Quarter at night............................

30 tháng 11 2021

1.  Pop music is my favorite kind of music.

2. It rained heavily yesterday so they didn't go camping.

3. I have played playing soccer for 5 years.

4. Jack is the same age as my son.

5. Because Mary was sick, she could not go to school.

6. I haven't met him for 3 years.

7. Lan finished her homework, so she went out.

8. He enjoys doing morning exercise.

9. We started to learn English for 3 years.

10. We have lived here since 2012.

11. Her book is different from mine.

12. It's a good idea to walk around the Old Quarter at night.

20 tháng 5 2018

 \(\Leftrightarrow\orbr{\begin{cases}2x-5=13\\2x-5=-13\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}2x=13+5\\2x=-13+5\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}2x=18\\2x=-8\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=18:2\\x=-8:2\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=9\\x=-4\end{cases}}\)

vậy \(x\in\left\{-4;9\right\}\)

20 tháng 5 2018

| 2x - 5| = 13

TH1: 2x - 5 = 13

         2x      = 13 +5

         2x       = 18

         x          = 18:2

         x           = 9

TH2: 2x - 5 = -13

         2x      = ( -13) + 5

         2x      =  -8

           x      = (-8) : 2

           x      = -4

KL: x = 9, hoặc x =  -4

AH
Akai Haruma
Giáo viên
17 tháng 6 2019

Bạn chưa có yêu cầu đề bài.

17 tháng 12 2016

Bỏ hết trị tuyệt đối ra:

= 18 - 15 + 37

= 40

29 tháng 12 2016

là 40 nhé

mình trả lời đầu tiên nên k mình 1 cái nha