Ответ:

1)

[tex] \frac{6a}{a} = 6[/tex]

2)

[tex] \frac{3}{12m} = \frac{1}{4m} [/tex]

3)

[tex] \frac{5b}{15b {}^{2} } = \frac{1}{3b} [/tex]

4)

[tex] \frac{6a {}^{5} }{30a {}^{4} } = \frac{a}{5} [/tex]

5)

[tex] - \frac{10c {}^{5} }{a} = - \frac{10c {}^{5} }{a} [/tex]

6)

[tex] \frac{14x {}^{3} y {}^{5} }{ - 7x {}^{2}y } = - 2xy {}^{4} [/tex]

7)

[tex] \frac{18c {}^{2} b {}^{3} }{27ac {}^{8} b {}^{3} } = \frac{6}{9ac {}^{6} } [/tex]

8)

[tex] \frac{ - 18bx {}^{4}y {}^{3} }{ - 42xy {}^{8} } = \frac{3bx {}^{3} }{7y {}^{5} } [/tex]