Алгебра: Решите алгебру очень надо

1.5.9. =1
1.5.10. $\frac{10^{2n+4}}{10^{2n+3}}=10$
1.5.11. $\frac{63^{n+1}}{3^{2n+1}*7^{n-2}}=\frac{9^{n+1}*7^{n+1}}{3^{2n+1}*7^{n-2}}=$ $\frac{3^{2n+2}*7^{n+1}}{3^{2n+1}*7^{n-2}}=\frac{3^{2n+1}*3*7^{n-2}*7^3}{3^{2n+1}*7^{n-2}}=3*7^3=1029$
1.5.12. $\frac{80^{n+4}}{5^{n+3}*2^{4(n+3)+1}}=\frac{(5*2^4)^{n+4}}{5^{n+3}*2^{4(n+3)+1}}=$ $\frac{5^{n+4}*2^{4(n+4)}}{5^{n+3}*2^{4(n+3)}*2}=\frac{5^{n+3}*5*2^{4(n+3)}*2^2}{5^{n+3}*2^{4(n+3)}*2}=5*2=10$
1.5.13 $\frac{50^{n+1}}{2^{n-3}*5^{2n+1}}=\frac{2^{n+1}*5^{2n+2}}{2^{n-3}*5^{2n+1}}=$ $\frac{2^{n-3}*2^4*5^{2n+1}*5}{2^{n-3}*5^{2n+1}}=2^4*5=80$