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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)
Trả lời:
A) \(136\times15+15\times64-2020\)
\(=15\times\left(136+64\right)-2020\)
\(=15\times200-2020\)
\(=3000-2020\)
\(=980\)
B) \(25,97+6,54-103,48\div4\)
\(=25,97+6,54-25,87\)
\(=0,1+6,54\)
\(=6,64\)
![](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)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 1,1 + 1,2 + 1,3 +.........+ 1,9 ) x (123,5 - 24,7x5)
=[(1,1+1,9 )+(1,2+1,8)(1,3+1,7)...+1,5 ]x (123,5 - 24,7x5)
=(3+3+3+3+1,5)x(123,5-123,5)
=12,5 x 0
=0
Chúc bạn học tốt !
(1,1 + 1,2 + 1,3 + ... + 1,19) x (123,5 - 24,7 x 5)
= (1,1 + 1,2 + 1,3 + ... + 1,19) x (123,5 - 123,5)
= (1,1 + 1,2 + 1,3 + ... + 1,19) x 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
( 1,1 + 1,2 + 1,3 +.........+ 1,9 ) x (123,5 - 24,7x5)
=[(1,1+1,9 )+(1,2+1,8)(1,3+1,7)...+1,5 ]x (123,5 - 24,7x5)
=(3+3+3+3+1,5)x(123,5-123,5)
=12,5 x 0
=0
Chúc bạn học tốt !
( 1,1 + 1,2 + 1,3 + .....+ 1,9 ) x ( 123,5 - 24,7 x 5 )
= ( 1,1 + 1,2 + 1,3 +....+ 1,9 ) x ( 123,5 - 123,5 )
= ( 1,1 + 1,2 + 1,3 +....+ 1,9 ) x 0
= 0
![](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. ( 76,46 +87,69 ) : 6,7 - 19,38 = 5,12
B. ( 24,7 + 16,25 ) : 1,5 - 6,17 = 21,13
![](https://rs.olm.vn/images/avt/0.png?1311)
\(= ( 1 , 1 + 1 , 2 + 1 , 3 + . . . + 1 , 9 ) × ( 123 , 5 − 24 , 7 × 5 ) \)
\(= ( 1 , 1 + 1 , 2 + 1 , 3 + . . . + 1 , 9 ) × ( 123 , 5 − 123 , 5 ) \)
\(= ( 1 , 1 + 1 , 2 + 1 , 3 + . . . + 1 , 9 ) × 0 \)
\(=0\)
TL :
25
HT
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