309 / 412 = 3/4 = 384 / 512 = 2014 - a / 512
=> 2014 - a = 384
=> a = 2014 - 384
=> a = 1630
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309 / 412 = 3/4 = 384 / 512 = 2014 - a / 512
=> 2014 - a = 384
=> a = 2014 - 384
=> a = 1630
309/412=2014-a/512
309/412=2014-a/512
309/412=2014-a/512
309/412=2014-a/512
309/412=2014-a/512
309/412 = 2014-a/512
309/412 = 2014 - a/ 512
a = ...
tìm a biết:309/412=2014-a/512
tim a biet 309/ 412 = 2014 - a / 512