![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Đáp án là B
Ta có:
- 12 2 .x = 56 + 10.13x
144x = 56 + 130x
144x - 130x = 56
14x = 56
x = 4
![](https://rs.olm.vn/images/avt/0.png?1311)
(124 x 237 + 152 ) : (870 = 235 x 122
= (29388 + 152) : ( 870 + 28670 )
= 29540 : 29540
= 1
![](https://rs.olm.vn/images/avt/0.png?1311)
( 124 x 237 + 152 ) : ( 870 + 235 x 122)
=[124 x (235+2) + 152 ] : [870 + 235 x (124-2)]
=[124 x 235+124x2 + 152 ] : [870 + 235 x124 - 235x2]
=[124 x 235+248 + 152 ] : [870 + 235 x 124 - 470]
=[124 x 235+ 400 ] : [870 - 470 + 235 x 124 ]
=[124 x 235+ 400 ] : [400 + 235 x 124 ]
=1
![](https://rs.olm.vn/images/avt/0.png?1311)
1990 x 1990 - 1992 x 1998
= 1990 x 1990 - ( 1992 - 2 ) x ( 1998 + 2 )
= 1990 x 1990 - 1990 x 2000
= 1990 x ( 2000 - 1990 )
= 1990 x 10
= 1900
( 124 x 237 + 152 ) : ( 870 + 235 x 122 )
= ( 124 x 235 + 248 + 152 ) : ( 235 x 124 + 400)
= ( 124 x 235 + 400 ) : ( 235 x 124 + 400)
= 1
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
x 8 = − 1 4 x .4 = − 1.8 x .4 = − 8 x = − 2
b)
6 x − 3 = 9 2 x − 7 6. 2 x − 7 = 9. x − 3 12 x − 42 = 9 x − 27 3 x = 15 x = 5
c)
x − 1 2 2 = 4 x − 1 2 = ± 2
TH1:
x − 1 2 = 2 x = 5 2
TH2:
x − 1 2 = − 2 x = − 3 2
Vậy x = 5 2 hoặc x = − 3 2
\(1^{22}\times3^{22222}\)
\(1\times3^{22222}\)
\(3^{22222}\)