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26
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AS
12
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14 tháng 7 2017
x + 12 - 45 = 78
x + 12 = 78 + 45
x + 12 = 123
x = 123 - 12
x = 111
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CN
14
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10
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18
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12 x 6 + 12 x 3 + 12
= 12 x ( 6 + 3 + 1 )
= 12 x 10
= 120
12 x (6+3+1)
=12 X 10
=120