172 x 68 + 53 x 172 - 172 x 21 =
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x − 17 2 − − 3 7 + 5 3 = − 1 3 x − 17 2 + 3 7 − 5 3 = − 1 3 x − 357 42 + 18 42 − 60 42 = − 1 3 x − 315 42 = − 1 3 x − 15 2 = − 1 3 x = − 1 3 + 15 2 x = − 2 + 45 6 x = 43 6
![](https://rs.olm.vn/images/avt/0.png?1311)
`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)
Tìm X biết: 2 x 172 x X x 252 = 172 x 2 x 252 x 5
X=5
![](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)
17 2 − − 3 7 + 5 3 = 17 2 − − 9 21 + 35 21 = 17 2 − 26 21 = 357 42 − 52 42 = 305 42
![](https://rs.olm.vn/images/avt/0.png?1311)
172 x 68 + 53 x 172 - 172 x 21
= 172 x ( 68 + 53 - 21 )
= 289 x 100
= 28900.
#Y/n
\(17^2.68+53.17^2-17^2.21\)
\(=17^2.\left(68+53-21\right)\)
\(=289.100\)
\(=28900\)