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2014-10-17T17:50:30+03:00
A+b = 40
2a+b= 65.
--------------------------- ( - )
2a+ b - (a+b) = 65 - 40
2a+b-a-b = 25
a= 25
b = 40 - 25
b = 15
9 4 9
2014-10-17T17:51:32+03:00
A+b=40
2a+b=65
scazi cele doua ecuatii si obtii a=15 si b=25
5 5 5