Răspunsuri

2014-07-02T22:27:42+03:00
(a+3a)/5=  4a/5

x/7 +3-x/7= 3

x+2/x+x-1/x= 2x+1/x=  (4x²+1)/x
2014-07-03T00:04:16+03:00
A/5 + 3a/5 = 4a/5

x/7 + 3 - x/7 = 3 (se simplifica x/7 cu - x/7)

x + 2/x + x  - 1/x = 2x + 1/x = 2x²/x + 1/x = 2x² + 1/x