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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,5+x=11-\left(-3\right)\)
\(5+x=14\)
\(x=9\)
\(b,\left(x-5\right)-3=2\)
\(x-5=5\)
\(x=10\)
\(c,-99:x-113=-124\)
\(-99:x=-11\)
\(x=9\)
a)5+x=14
=>x=14-5
=>x=9
Vậy x=9
b)x-5=2+3
=>x-5=5
=>x=10
vậy x=10
c)-99:x=(-124+113)
=>-99:x=-11
=>x=-9
vậy x=-9
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-99:x-113=-114\)
\(\Leftrightarrow-99:x=-1\)
\(\Leftrightarrow x=99\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=123+124+125-113-114-115
=(123-113)+ (124-114)+ (125-115)
=10+10+10
=30
\(\text{(123+ 124 + 125) – (113 + 114 + 115)}\)
\(=123+124+125-113-114-115\)
\(=\left(123-113\right)+\left(124-114\right)+\left(125-115\right)\)
\(=10+10+10=30.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1
2997 + 113 = 3110 199 + 56 = 255 121 - 98 = 23 286 - 99 = 187
213 - 997 = -784 16 x 50 = 800 28 x 25 = 700 24 x 125 =3000
1300 : 50 = 26 600 : 25 = 24 3000 : 125=24
![](https://rs.olm.vn/images/avt/0.png?1311)
-99: x- 113= -124
- 99 :x= -124+113
-99 :x= -11
x= -99: (-11)
x= 9
Vậy...
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