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2014-11-02T20:12:07+02:00
A+b=21
a=4b+1
Inlocuim in prima a cu 4b+1: 5b+1=21 | -1
5b = 20 | :5
b=4
a=4*4+1
a=17
3 5 3
2014-11-02T20:12:18+02:00
A+b=21
a=4b+1
4b+1+b=21 |-1
5b=20 | :5
b=4
a+4=21 |=> a=17
2 5 2