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![](https://rs.olm.vn/images/avt/0.png?1311)
175+Xx12=12175
=>Xx12=12175-175
=>Xx12=12000
=>X=12000:12
=>X=1000
tick cho mình nha
![](https://rs.olm.vn/images/avt/0.png?1311)
Xx3+Xx5+Xx7+.......+Xx101= 31200
Xx(3+5+7+.....+101)= 31200
Xx 2600= 31200
X= 12
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( 532 * 7 - 266 * 14 ) * ( 532 * 7 - 266 )
= ( 3724 - 3724 ) * ( 3724 - 266 )
= 0 * 3458
=0
tk nha bạn mình nhanh nhất đấy
![](https://rs.olm.vn/images/avt/0.png?1311)
( 532 x 7 - 266 x 14 ) x ( 532 x 7 + 266 )
= 0 x( 532 x 7 + 266 )
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
532 x 7 x 14 x ( 266 - 266 )
532 x 7 x 14 x 0
532 x 7 x 0
532 x 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
a, ( 532 x 7 - 266 x 14 ) x ( 532 x 7 + 266 )
= 3724 - 3714 x 3724 + 266
= 0 x 3990
= 0
b, 117 x ( 36 + 62 ) - 17 x ( 62 + 36 )
= 117 x 98 - 17 x 98
= 11466 - 1666
= 9800
![](https://rs.olm.vn/images/avt/0.png?1311)
a) = 117 x 100 - 17 x 100
= ( 117 - 17 ) x 100
= 100 x 100
= 10000
b) ( 532 x 7 - 266 x 14 ) x ( 532 x 7 + 266 )
= 532 x 7 - 266 x ( 2 x 7 ) x 3990
= 532 x 7 - 266 x 2 x 7 x 3990
= (532 x 7 - 532 x 7) x 3990
= 0 x 3990
= 0
c) 506 x 5 + 1012 + 253 x 6
= 506 x 5 + (506 x 2) + 253 x ( 2 x 3 )
= 506 x 5 + 506 x 2 + 253 x 2 x 3
= 506 x 5 + 506 x 2 + 506 x 3
= 506 x ( 5 + 2 + 3 )
= 506 x 10
= 5060
\(x\times7+x\times12=266\\ x\times\left(7+12\right)=266\\ x\times19=266\\ x=266:19\\ x=14\)
X x 7 + X x 12 = 266
X x ( 7 + 12 ) = 266
X x 19 = 266
X = 266 : 19
X = 14.