Răspunsuri

2014-09-20T20:14:21+03:00

a+b = 12      ] :ab ⇒⇒⇒ 12/24 = a/ab +b/ab = 1/b+ 1/a  ⇒ 1/a/+ 1/b = 1/2



2014-09-20T20:15:32+03:00
Relatiile lui Viete:
 a+b=12 => S=12;
 ab=24 => p=24

1/a²+1/b²= (a²+b²)/a²b²=((a+b)²-2ab)/a²b²=(S²-2p)/p²=(12²-48)/24²=(144-48)/576=96/576=1/6
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