![](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)
![](https://rs.olm.vn/images/avt/0.png?1311)
25, 97 + 6, 54 + 103, 46
= 25, 97 + ( 6, 54 + 103 , 46 )
= 25, 97 + 110 = 135, 97
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 25,97 + 6,54 + 103,46
= 25,97 + (6,54+103,46)
= 25,97+110
= 135,97
b. 50% + 7/12-1/2
= 1/2+7/12-1/2
= (1/2-1/2)+7/12
= 0+7/12
= 7/12
c. 2015.65 + 2015.45 - 2015.10
= 2015. (65+45-10)
= 2015.100
= 201500
2.a.2/3.x+3/4=3
=> 2/3.x=3-3/4
=> 2/3.x=9/4
=> x=9/4:2/3
=> x=9/4.3/2
=> x=27/8
b. 100-7(x-5)=58
=> 7(x-5)=100-58
=> 7(x-5)=42
=> x-5=42:7
=> x-5=6
=> x=6+5
=> x=11
c. x+1/3=7/26 x 13/6
=> x+1/3 = 7/12
=> x=7/12-1/3
=> x=7/12-4/12
=> x=3/12
=> x=1/4
![](https://rs.olm.vn/images/avt/0.png?1311)
a, ( 138,4 - 83,2 ) : 24 + 19,22
= 55,2 : 24 + 19,22
= 2,3 + 19, 22
21.52
b, 6,54 + ( 75,4 - 29,48 ) : 4
= 6,54 + 45,92 : 4
= 6,54 + 11, 48
=18,02
![](https://rs.olm.vn/images/avt/0.png?1311)
a. (138,4 - 83,2) : 24 + 19,22 = 21,52
b. 6,54 + (75,4 - 29,48) : 4 = 18,02
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 138,4 - 83,2 ) : 24 + 19,22
= 55,2 : 24 + 19,22
= 2,3 +19,22
= 21,52
6,54 + (75,4 - 29,48 ) x 4
= 6,54 + 45,92 x 4
= 6,54 + 183,68
= 190,22
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (138,4 - 83,2) : 24 + 19,22
= 55,2 : 24 + 19,22
= 2,3 + 19,22
= 21,52
b) [6,54 + (75,4 - 29,48)] :4
= (6,54 + 45,92) :4
= 52,46 : 4
= 13,115
2..................................
a) 8,7 - x = 5,3 + 2
8,7 - x = 7,3
x = 8,7 - 7,3
x = 1,4
b) x * 5,3 = 9,01 * 4
x * 5,3 = 36,04
x = 36,04 : 5,3
x = 6,8
![](https://rs.olm.vn/images/avt/0.png?1311)
Trả lời:
A) \(136\times15+15\times64-2020\)
\(=15\times\left(136+64\right)-2020\)
\(=15\times200-2020\)
\(=3000-2020\)
\(=980\)
B) \(25,97+6,54-103,48\div4\)
\(=25,97+6,54-25,87\)
\(=0,1+6,54\)
\(=6,64\)
A>=[136+64]*15-2020
=200*15-2020
=3000-2020
=80