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2014-04-22T02:17:08+03:00
A+b=80
a-b=20
 prin adunarea celor 2 ecuatii obtinem
2a/=100
a=50    b=30
2 4 2
2014-04-22T06:32:05+03:00
A+b=80
a-b=20⇒a=20+b
20+b+b=80
2b+20=80
2b=80-20
2b=60
b=30
a=20+30
a=50