Răspunsuri

2014-05-21T21:12:53+03:00
2014-05-21T21:12:55+03:00
Faci produsul mezilor egal produsul extremilor:
7*(x+1) = 9x
7x + 7 = 9x
2x = 7
x = 7/2

Spor !
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