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3
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25 tháng 8 2016
456 + 123 + 789 + 456 + 123 + 789
= 456 + 456 + 123 + 123 + 789 + 789
= 456 x 2 + 123 x 2 + 789 x 2
= 2 x ( 456 + 123 + 789 )
= 2 x 1368
= 2736
mk trước nhé
NT
8
24 tháng 11 2016
=24+6+10+24=30+10+24=40+24=64
nhớ tích mình thì mình tích lại !
TD
4
NA
5
PH
25

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