1) 3/8 - 7/12 = 9/24 - 14/24 = -5/24
2) -5/24 * 1 целая 1/3 = -5/24 * 4/3 = -5/18
3) -5/18 + 5/6 = -5/18 + 15/18 = 10/18 = 5/9.
(5^(1-5n))^2=5^2/5^10n
(4^(2n+1))^3=4^6n*4^3
(2.5)^11n=5^11n/2^11n
160=2^5*5
(5^2/5^10n*2^12n*2^6*5^11n/2^11n)/2^5*5=5^2*2^n*5^n*2^6/2^5*5=2^(n+1)5^(n+1)=
= 10^(n+1)
![1 - 5log_{x}3 + 6log^{2}_{x}3 < 0\\ log_{x}3=a\\ 1-5a+6a^2<0\\ 6a^2-5a+1<0\\ 6(a-1/2)(a-1/3)<0\\ 1/3<a<1/2](https://tex.z-dn.net/?f=1+-+5log_%7Bx%7D3+%2B+6log%5E%7B2%7D_%7Bx%7D3+%3C+0%5C%5C+log_%7Bx%7D3%3Da%5C%5C+1-5a%2B6a%5E2%3C0%5C%5C+6a%5E2-5a%2B1%3C0%5C%5C+6%28a-1%2F2%29%28a-1%2F3%29%3C0%5C%5C+1%2F3%3Ca%3C1%2F2)
10, 11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26
Ответ : 17 верно