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Đỗ Thị Minh Anhanswered a question
20/08/2017 at 21:35
90 + 501 = 591
Đỗ Thị Minh Anhanswered a question
20/08/2017 at 21:34
60 + 12 = 72
Đỗ Thị Minh Anhanswered a question
20/08/2017 at 21:34
70 + 12 = 82
Đỗ Thị Minh Anhanswered a question
20/08/2017 at 21:33
56 + 82 = 138
Đỗ Thị Minh Anhanswered a question
20/08/2017 at 21:31
50 + 300 + 50 + 100

= ( 50 + 50 ) + ( 100 + 300 )

= 100 + 400

= 500

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