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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)
a) 135 + x -135 = 0 => (135 - 135) + x = 0 => x = 0.
b) -562 - x + 562 = 0 => (-562 + 562) - x = 0 => - x = 0 => x = 0.
c) 61 + x - 23 = 91=> (61 - 23) + x = 91=>38 + x = 91=> x = 53.
d) 11 + 53 - x = 97 => 64 - x = 97 => x = 64 - 97 => x = - 33
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a)[(x+32)+17] :2=42
(x+32)+17=42.2
(x+32)+17=84
x+32=84-17
x+32=67
x=67-32
x=35
b)[61+(53-x)]:17=1785
61+(53-x)=1785.17
61+(53-x)=10345
53-x=30345-61
53-x=30284
x=53-30284
x=-30231
![](https://rs.olm.vn/images/avt/0.png?1311)
a) => (x+32) - 17 = 42:2 = 21
=> x+32 = 21+17 = 38
=> x=38-32=6
b) => 61+(53-x) = 1785:17=105
=> 53-x = 105-61=44
=> x = 53-44 =9
c) => x^2 +54 -32 = 244:2 = 122
=> x^2 +22 = 122
=> x^2 = 122-2=100
=> x= 10 hoặc -10
giải oy pn **** giùm mk nka
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[(x + 32) - 17] . 2 = 42
(x + 32) - 17 = 42 : 2
(x + 32) - 17 = 21
x + 32 = 21 + 17
x + 32 = 38
x = 38 - 32
x = 6
Vậy x = 6
![](https://rs.olm.vn/images/avt/0.png?1311)
[61+(53-x)].17=1785
[61+(53-x)]=1785:17=105
61+(53-x)=105
53-x=105-61
53-x=44
x=44+55
x=99
vay x=99
[61+(53-x)].17=1785
=>[61+(53-x)]=1785:17
=>114 -x=105
=>x=114-105
=>x=9
nhưng bạn ơi
đề ko có kết quả nhé
ok nha bạn