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2014-10-19T15:26:24+03:00
A+2b+c=51
2a+b+2c=42
se aduna cele2 ecuatii si rezulta
3a+3b+3c=93
3(a+b+c)=93
a+b+c=93:3
a+b+c=31

1 5 1
2014-10-19T15:27:27+03:00
 a+ 2b+ c =51
2a+ b+ 2c=42 
------------------------adunam in jos 
3a+3b+3c=93  dam factor comun pe 3
3*(a+b+c)=93
a+b+c=93:3
a+b+c=31