dezvoltarea are 16 termeni
[tex] T_{7}= T_{6+1}= C^6_{15}* (\frac{ x^{2} }{y})^9* (\frac{ \sqrt{y} }{x} )^6= \frac{15!}{6!*9!}* \frac{ x^{18} }{y^9}* \frac{y^3}{x^6} = \\ = \frac{10*11*12*13*14*15}{1*2*3*4*5*6}* \frac{ x^{12} }{y^6} =5005 \frac{ x^{12} }{y^6} [/tex]
