Răspunsuri

2014-11-18T21:28:28+02:00
A+b=50⇒A=50-b A+b:2=40 50-b+b:2=40 b+b:2=10 b+b=5 b=2.5 A=47.5
2014-11-18T21:29:17+02:00
A+b=50⇒a=50-b
a+b/2=40
50-b+b/2=40
100-2b+b=80
100-b=80
b=100-80
b=20

a=50-20
a=30