Сократите дробь: a) $$rac{6x^3}{8x^5}$$; б) $$rac{10x^8}{5x^4}$$; в) $$rac{6x^5}{7x^5}$$; г) $$rac{6a^2b}{9ab^2}$$; д) $$rac{12x^3y^2}{5x^4y^3}$$; e) $$rac{-2,1a^4x^3}{3,5a^3x^4}$$; ж) $$rac{-\frac{3}{7}a^5x^6}{\frac{2}{21}a^4y^2}$$; з) $$rac{216a^2b^3c^4}{64a^5bc^4}$$

a) $$\frac{6x^3}{8x^5} = \frac{3}{4x^2}$$

б) $$\frac{10x^8}{5x^4} = 2x^4$$

в) $$\frac{6x^5}{7x^5} = \frac{6}{7}$$

г) $$\frac{6a^2b}{9ab^2} = \frac{2a}{3b}$$

д) $$\frac{12x^3y^2}{5x^4y^3} = \frac{12}{5xy}$$

e) $$\frac{-2,1a^4x^3}{3,5a^3x^4} = -\frac{3a}{5x}$$

ж) $$\frac{-\frac{3}{7}a^5x^6}{\frac{2}{21}a^4y^2} = -\frac{3}{7} \cdot \frac{21}{2} \cdot \frac{a^5}{a^4} \cdot \frac{x^6}{y^2} = -\frac{9ax^6}{2y^2}$$

з) $$\frac{216a^2b^3c^4}{64a^5bc^4} = \frac{27b^2}{8a^3}$$