Răspunsuri

2014-04-13T11:13:05+03:00
A=4-b
(4-b)b=2
1/a+1/b=1/(4-b)+1/b=b-4-b/(4-b)b=-4/2=-2
2014-04-13T11:20:16+03:00
1/a+1/b=(a+b)/ab                  //prin aplificare
1/a+1/b=4/2=2