Question

Exercitiile C22 , C25 , C27, C28 . Va rog !!!!

Answer 1

Răspuns:

22.(n+2)!/n!=12

n!(n+1)(n+2)/n!=12

(n+1)(n+2)=3*4=>

n+1=3

n+2=4=>

n=2

25)Cₙ⁰+Cₙ¹=2012

1+n=2012

n=2011

27)(2x+∛x)¹⁰=

(2x+x^1/3)¹⁰

Tₙ₊₁=T₆=>

n+1=6

n=5

T₆=C₁₀⁶(2x)⁶*(x^1/3)¹⁰⁻⁶=

10!/6!*(6-4)!*2⁶*x⁶(x^1/3)⁴=

7*8*9*10/2!*64*x⁶*x^4/3=

7*8*9*5*64x^(6+4/3)=

56*45*64*x^22/3=

161280x^22/3

Explicație pas cu pas:

Answer 2

Răspuns:

Explicație pas cu pas: