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2014-11-10T16:33:36+02:00
a7 
b    5
a * b = 1260
5a = 7b
a = 1260 : b
5 * 1260/b = 7b
6300 = 7b²
b² = 6300 : 7
b² = 900 
b = √900
b = 30
a = 1260 : 30
a = 42
Verificare:
a/b = 42/30 = 7/5 si 42 * 30 = 1260
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