(175+25+13)-(-15+175+25)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 175 + 52 + 13 ) - [ -15 + 175 - ( -25 )]
= ( 175 + 25 + 13 ) - ( -15 + 175 + 25 )
= 175 + 25 + 13 - 15 - 175 - 25
= -2
( 175 + 52 + 13 ) - [ -15 + 175 - ( -25 )]
= ( 175 + 25 + 13 ) - ( -15 + 175 + 25 )
= 175 + 25 + 13 - 15 - 175 - 25
= -2
![](https://rs.olm.vn/images/avt/0.png?1311)
Bỏ dấu ngoặc rồi tính:
a) (123 - 27)+ (27+ 13-123) -= 123 - 27 + 27 + 13 - 123 = 13
b) (175 + 25 + 13)-(-15 + 175 + 25) = 175 + 25 + 13 + 15 - 175 - 25 = 28
c) (2012 - 119 + 29) - (-119 + 29) = 2012 - 119 + 29 + 119 - 29 = 20122
d) -(55 - 80 + 91) - (2012 + 80 - 91) = - 55 + 80 - 91 - 2012 - 80 + 91 = - 2067
e) 123 + [54 + (-123) + 46] = 123 + 54 - 123 + 46 = 100
f) - 64 + [(-110 + 64 + 71] = -64 -110 +64 + 71 = -39
![](https://rs.olm.vn/images/avt/0.png?1311)
a) `123 - 27 + 27 + 13 - 123`
`= (123 - 123) + (27 - 27) + 13`
`= 0 + 0 + 13`
`= 13`
`---`
b) `175 + 25 + 13 + 15 - 175 - 25`
`= (175-175)+(25-25)+25+13`
`=0+0+25+13`
`=28`
`---`
c) \(53\times39+47\times39+53\times21+47\times21\)
\(=\text{[}\left(53+47\right)\times39]+\left[\left(53+47\right)\times21\right]\)
\(=\left(100\times39\right)+\left(100\times21\right)\)
\(=3900+2100\)
`=6000`
`---`
d) \(49\times35+49\times16-49\times61\)
`=` \(49\times\left(35+16-61\right)\)
`=` \(49\times\left(-10\right)\)
`=-490`
![](https://rs.olm.vn/images/avt/0.png?1311)
1) 31-3.(x+2) = 7
3.(x+2) = 31- 7
3.(x+2) = 24
x+2 = 24:3
x + 2 = 8
x = 8-2
x = 6
2) 175-25.(2x-1) = 175
25.(2x-1) = 175- 175 = 0
2x-1 = 0 : 25 = 0
2x = 0 + 1 = 1
x = 1 : 2 = 0,5
3) 25 - x/2 = 19
x/2 = 25-19
x/2 = 6
x : 2 = 6
x = 6 x 2 = 12
4) 2.(x-1)+3 = 15
2.(x-1) = 15 - 3 = 12
x - 1 = 12 : 2 = 6
x = 6+1 = 7
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\dfrac{17}{20}< \dfrac{18}{20}< \dfrac{18}{19}\Rightarrow\dfrac{17}{20}< \dfrac{18}{19}\)
b) \(\dfrac{19}{18}>\dfrac{19+2024}{18+2024}=\dfrac{2023}{2022}\Rightarrow\dfrac{19}{18}>\dfrac{2023}{2022}\)
c) \(\dfrac{135}{175}=\dfrac{27}{35}\)
\(\dfrac{13}{17}=\dfrac{26}{34}< \dfrac{26+1}{34+1}=\dfrac{27}{35}\)
\(\Rightarrow\dfrac{13}{17}< \dfrac{135}{175}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Đúng rồi đó, bằng 2.
Ta có: 7/21+3/21+14/21=7+3+14/21=24/21
125/175+25/175=125+25/175=150/175
Vì 24/21=8/7;150/175=6/7 nên 8/7+6/7=14/7=2
= 175 + 25 + 13 +15 - 175 - 25
= 13 + 15
= 28
hok tốt!
(175+25+13)-(-15+175+25)
=175+25+13+15-175-25
=175-175+25-25+13+15
=0+0+28
=28
HOK TỐT