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Aflati termenul care nu contine x din dezvoltarea [tex] ( \sqrt[3]{x} + \frac{2}{ \sqrt{x} } ) ^{200} [/tex] , x>0.  Imi  zice-ti va rog?!

Răspuns :

(x^1/3+2*x^ (-1/2))^200

Tk+1=Combinaride 200luate cate K *( x^1/3)^ (200-k) *2^k*(x^(-1/2))^k


x^ ((200-k)/3)* x^ (-k/2)=x^0=1
(200-k)/3-k/2=0
(200-k)/3=k/2
400-2k=3k
400=5k
k=80

T81=(Combinaride 200luate cate 80)*2^80=2^80 * Combinaride 200 luate cate 80

Nu il calculeaza nimeni