2)

[tex](1 \times \frac{3}{7} \times (0.7) {}^{6} = ( \frac{10}{7} )^{5} \times 0,117649 = \frac{100000}{16807} \times 0.117649 = 0.7[/tex]

3)

[tex] \frac{36 {}^{8} }{2 {}^{13} \times 3 {}^{18} } = \frac{2821109907456}{8192 \times 387420489} = \frac{2821109907456}{3173748645888} = \frac{8}{9} [/tex]