Представьте выражение в виде степени:
a) $$x^5 \cdot x^8 = x^{5+8} = x^{13}$$
б) $$m^{14}: m = m^{14-1} = m^{13}$$
в) $$(a^5)^{13} = a^{5 \cdot 13} = a^{65}$$
г) $$\frac{t^3 \cdot t^4}{t^6} = \frac{t^{3+4}}{t^6} = \frac{t^7}{t^6} = t^{7-6} = t^1 = t$$
д) $$(b^7)^3: (b^5)^4 = b^{7 \cdot 3} : b^{5 \cdot 4} = b^{21} : b^{20} = b^{21-20} = b^1 = b$$
е) $$\frac{n^2 \cdot (n^3)^4}{n^7} = \frac{n^2 \cdot n^{3 \cdot 4}}{n^7} = \frac{n^2 \cdot n^{12}}{n^7} = \frac{n^{2+12}}{n^7} = \frac{n^{14}}{n^7} = n^{14-7} = n^7$$