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2014-09-07T00:51:46+03:00

47 = n×a +2     na = 45 = 5×9                            47=5×9 +2

53 = n×b +3      nb = 50=5×10                          53 = 5×10 +3

64 = n×c +4      nc = 60 = 5×12   ⇒ n=5            64 = 5×12 +4


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