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12 * 12 * 12 * 12 * 12 * 12 * 12 *12 = 12 * 8 = 96
K mk nha nguyen thuy hang
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 12 = 12
x = 12 - 12
x = 0
x - 12 = 12
x = 12 + 12
x = 24
x + 14 = 56
x = 56 - 14
x = 42
Trao đổi tk
x + 12 = 12
x = 12 - 12
x = 0
x - 12 = 12
x = 12 + 12
x = 24
x + 14 = 56
x = 56 - 14
x = 42
k cho mik nhe !
![](https://rs.olm.vn/images/avt/0.png?1311)
y x 12 = 12x 12
y x 12 =144
y = 144 :12
y =12 ai k mk mk k lai nhe
\(y\times12=12\times12\)
\(y\times12=144\)
\(y=144\div12\)
\(y=12\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
12 x 22 + 12 x 18 + 12 x 24
= 12 x ( 22 + 18 + 24 )
= 12 x 64
= 768
12 x 22 + 12 x 18 + 12 x 24
= 12 . ( 22 + 28 + 24 )
= 12 . 74
= 888
![](https://rs.olm.vn/images/avt/0.png?1311)
12 + 21 x 12 + 12 x 34
= 12 x ( 1 + 12 + 34 )
= 12 x 45
= 540
12 + 21 x 12 + 12 x 34
= 12 x 1 + 21 x 12 + 12 x 34
= 12 x (1+21+34)
= 12 x 56
= 672
![](https://rs.olm.vn/images/avt/0.png?1311)
12 x 3 + 12 x 7 + 12 x 9 + 12 x 1
= 12 x ( 3 + 7 + 9 + 1 )
= 12 x 20
= 240
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
X x 12 + 12= 120
X x 12 = 120 - 12
X x 12 = 108
X = 108 : 12
X = 9
Chúc học tốt nha!
kết quả là 144