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`a, = 53 xx (12+172 -84)`
`= 53 xx 100`
`=5300`
`b,= 2018 xx (91-45-46)`
`= 2018 xx 0`
`=0`
![](https://rs.olm.vn/images/avt/0.png?1311)
53 x 172 - 53 x 84 + 12 x 53
= 53 x (172 - 84 + 12)
= 53 x 100
= 5300.
Nếu đúng xin like
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(12.53+53.172-53.84\)
\(=53.\left(12+172\right)-53.84=53.184-53.84\)
\(=53.\left(184-84\right)=53.100=53.10^2\)
\(=53.10.10=530.10\)
\(=5300\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Rightarrow2\left(x-172\right)=156+111\\ \Rightarrow2\left(x-172\right)=267\\ \Rightarrow x-172=\dfrac{267}{2}\\ \Rightarrow x=\dfrac{267}{2}+172\\ \Rightarrow x=\dfrac{267+2\times172}{2}\\ \Rightarrow\dfrac{267+344}{2}=\dfrac{611}{2}\)
\(2\left(x-172\right)-111=156\)
\(\Rightarrow2\left(x-172\right)=156+111\)
\(\Rightarrow2\left(x-172\right)=267\)
\(\Rightarrow x-172=\dfrac{267}{2}\)
\(\Rightarrow x=\dfrac{267}{2}+172\)
\(\Rightarrow x=\dfrac{267}{2}+\dfrac{172\cdot2}{2}\)
\(\Rightarrow x=\dfrac{267}{2}+\dfrac{344}{2}\)
\(\Rightarrow x=\dfrac{611}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2\left(x-172\right)-111=155\)
\(\Rightarrow2\left(x-172\right)=155+111\)
\(\Rightarrow2\left(x-172\right)=266\)
\(\Rightarrow x-172=266:2\)
\(\Rightarrow x-172=133\)
\(\Rightarrow x=133+172\)
\(\Rightarrow x=205\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1) -x - 3 = 7
-x = 7 + 3
-x = 10
x = -10
2) x + 5 = -10
x = -10 - 5
x = -15
3) 2x - 7 = 713
2x = 713 + 7
2x = 720
x = 720 : 2
x = 360
4) -129 - (35 - x) = 55
35 - x = -129 - 55
35 - x = -184
x = 35 - (-184)
x = 219
5) 103 - x = 16 - (13 - 8)
103 - x = 16 - 5
103 - x = 11
x = 103 - 11
x = 192
172 x 68 + 53 x 172 - 172 x 21
= 172 x ( 68 + 53 - 21 )
= 289 x 100
= 28900.
#Y/n
\(17^2.68+53.17^2-17^2.21\)
\(=17^2.\left(68+53-21\right)\)
\(=289.100\)
\(=28900\)