Решите плиз , 30 задание

Question

Решите плиз , 30 задание

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Answer 1

(2-n)^3 +(2+n)^3=8-3*4*n+3*n^2 *2-n^3+8+12n+6n^2+n^3=16+9n^2;
(n+1)^2+(n-1)^2=n^2+2n+1+n^2-2n+1=2n^2 +2
lim( (16+9n^2)/(2n^2+2))=16/2=8      /:n^2
n->