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2014-10-06T17:22:17+03:00
A*b+a*c=420
a*(b+c)=420
a*14=420
a=420:14
a=30
2 5 2
2014-10-06T17:22:54+03:00
A(b+c)=420 inlocuiesti b+c=14 => a*14=420 => a=30
1 4 1