K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Các câu hỏi dưới đây có thể giống với câu hỏi trên
G
10 tháng 7 2017
-292 - { 1357 + 4 [( -8)3 + ( 18 - 146 ) : ( 7 -3 )2 ]}
= ( - 841 )- { 1357 + 4 . [ ( -512 ) + ( 18 - 146 ) : 16
= ( - 841 ) - { 1357 + 4 . [ ( -512 ) + ( - 128 ) : 16 ]}
= ( - 841 ) - { 1357 + 4 . [ ( -512 ) + ( - 8 ) }
= ( - 841 ) - { 1357 + 4 . ( - 520 ) }
= ( - 841 ) - { 1357 + ( -2080 ) }
= ( - 841 ) - ( -723 )
= ( - 118 )
PT
1
VT
5 tháng 8 2017
a) ( 195 - x3 ) : 7 + 105 : 102 = 28 . 22
=> (195 - x3 ) : 7 + 1000 = 1024
=> (195 - x3 ) : 7 = 1024 - 1000 = 24
=> 195 - x3 = 24 . 7 = 168
=> x3 = 195 - 168 = 27
=> x = 3 hoặc x = - 3
Vậy : x = 3 hoặc - 3
b) 3 . ( x2 - 65 ) + 15 = 810 : 88 - 1690
=> 3 . ( x2 - 65 ) + 15 = 64 - 1 = 63
=> 3 . ( x2 - 65 ) = 63 - 15 = 48
=> x2 - 65 = 48 : 3 = 16
=> x2 = 16 + 65 = 81
=> x = 9 hoặc x = - 9
Vậy : x = 9 hoặc x = - 9
TD
24 tháng 12 2016
Bài 1 : Chia đông từ trong ngoặc .
1.What are there to drink for dinner?
2. We are tired and we'd like to sit down.
3. What does your sister want? - She wants a cold drink .
4. I am not hungry and I don’t want any rice .
5. Are there any bananas ?
6. What does Mr Minh feel now ?
LT
24 tháng 12 2016
5 Are there any bananas?
2 were - to sit
4 am not , don't want
( mấy câu kia mk thấy đề sao sao ý )
PA
7 tháng 7 2016
1. Your school / city
Where is your school?
It is in a city.
2. His living room / 1 st floor
Where is his living room?
It is in the first floor.
3. He / 7
Which grade is he studying?
He is in grade 7.
4. Her brother / 12A
Which is her brother class?
It is 12A.
5. Nam 's class / 3 rd floor
Where is Nam's class?
It is on the third floor.
6. her house / Trang Tien street
Where is her house?
It is on Trang Tien Street.
7. Your room / 2 nd floor
Where is your room?
It is on the second floor.
8. Lan's room / 4 th floor
Where is Lan's room?
It is on the fourth.
9. Nga's house / country
Where is Nga's house?
It is in a country.
10. he/ class 9d
Where is he studying?
He's in class 9d.
TD
7 tháng 7 2016
1.Where is your school?
2.Where is his living room?
3.Where is he?
4.Where is her brother?
5.Where is Nam's class?
6.Where is her house?
7.Where is your room?
8.Where is Lan's room?
9.Where is Nga's house?
10.Where is class 9d?
T
5 tháng 8 2018
1 ) We are in grade 7 . our classroom is on the 2nd floor
2 ) They live in a house on Le Loi Street.
3 ) My mother usually goes shopping on Friday morning.
4 ) Sophia's birthday is on May 16th
5 ) my friend's birthay is on June.
T
5 tháng 8 2018
1) fill in the blanks with a suitable preposition
1 ) We are ..in.. greade 7 . our classroom is ..on.. the 2nd floor
2 ) they live ..in.. a house ..on.. Le Loi Street.
3 ) my mother usually goes shopping .. on... Friday morning.
4 ) Sophia's birthday is ..on.. May 16th
5 ) my friend's birthay is ..on.. June.
SL
6
17 tháng 8 2016
Tìm x, biết:
a. 12 + x = 122
=> x=122-12
=> x= 110
b. | x | + 4 = 8
=> /x/=8-4
=> /x/=4
=> x={4;-4}
c. 3x - 5 . 32 = 32 . 4
=> 3x=32.(4+5)
=> 3x=32.32
=> 3x=34
=> x=4
IM
17 tháng 8 2016
a)
\(12+x=122\)
=> \(x=110\)
Vậy \(x=110\)
b)
\(\left|x\right|+4=8\)
\(\Rightarrow\left|x\right|=4\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=4\\x=-4\end{array}\right.\)
Vậy x=4 ; x = - 4
c)
\(3^x-5.3^2=4.3^2\)
\(\Rightarrow3^x=3^2\left(4+5\right)\)
\(\Rightarrow3^x=3^4\)
=> x=4
Vậy x=4
TD
25 tháng 12 2016
, .
...1.I...am very lucky . I go to a wonderful . country...2.... I enjoy it very much . I don't have much . homework...3....so I have plenty of time to .. do..4.... interesting things . I do a lot of ... sport..5..... I go to an exercise class , go .. to..6.... dance classes , and I swim . twice..7.... a week . I love going to the.. movies..8.... with my friends . Some times we have parties . On the . weekend...9.... we often go on cycle rides into the fresh air of the .. school..10.... .
9 tháng 4 2016
Ta có: 1/22< 1/1.2=1-1/2
1/32<1/2.3=1/2-1/3
..............................
1/1002< 1/99.100=1/99-1/100
Do đó: 1+1/22+1/32+...+1/1002< 1+1-1/2+1/2-1/3+....+1/99-1/100
=> 1+1/22+1/32+....+1/1002<1+1-1/100=2-1/100<2
nên 1+1/22+1/32+....+1/1002<2
Vậy 1+1/22+1/32+...+1/1002<2
\(74.\) \(\left(2x-1\right)^3\)- \(5^2\)= \(7^{18}:7^{16}\)
\(74.\)\(\left(2x-1\right)^3\)\(-5^2\)= \(7^{18-16}\)
\(74.\)\(\left(2x-1\right)^3\)\(-25\)= \(7^2\)
\(74.\)\(\left(2x-1\right)^3\)\(-25\)= \(49\)
\(74.\)\(\left(2x-1\right)^3\)= \(49+25\)
\(74.\)\(\left(2x-1\right)^3\)= \(74\)
\(\left(2x-1\right)^3\)= \(74:74\)
\(\left(2x-1\right)^3\)= \(1\)
\(\left(2x-1\right)^3=1^3\)
\(2x-1=1\)
\(2x=1+1\)
\(2x=2\)
\(x=2:2\)
\(x=1\)
Vậy x = 1