An=6^n (n^2-1)/n! An+1=6^n+1((n+1)^2-1)/(n+1)!
lim n->∞ An+1/An= 6^n+1((n+1)^2-1)/(n+1)!×n!/6^n(n^2-1)=
lim n->∞ 6^n6((n+1)^2-1)1*2*3...*n/1*2*3...*n(n+1)*6*(n^2-1)=
6lim n->∞(n+1)^2-1/(n+1)(n^2-1)=6lim n->∞n^2+2n+1-1/(n+1)(n^2-1)=
<span>6lim n->∞ n(n+2)/(n+1)(n^2-1)</span>
a=b-0.4b=0.6b ,(2a+3b) / (a+6b)= (2*0.6b+3b)/ (0.6b+6b)= 4.2b/6.6b=7/11 .
А)10√3-4√48-√75=10√3-4√16×3-√25×3=
10√3-16√3-5√3= -11√3
Б)(5√2-√18)*√2=10-6=4
В)(3-√2)^2=(3-√2)(3-√2)=9-3√2-3√2+2=11-6√2