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CC
17
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VT
15
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15
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20 tháng 11 2018
1800 + 1500 + 1200 +1500
= (1800 + 1200 ) + ( 1500 + 1500 )
= 2000 + 2000
= 4000
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17
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13
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CN
13
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CC
12
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CC
6
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13
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8900 + 9700 + 1200
= 18 600 + 1200
= 19 800
8900 + 9700 + 1200 = 19800
mik nha