Решение:
1) $$0,2 = \frac{2}{10} = \frac{1}{5}$$
2) $$0,88 = \frac{88}{100} = \frac{22}{25}$$
3) $$0,64 = \frac{64}{100} = \frac{16}{25}$$
4) $$0,78 = \frac{78}{100} = \frac{39}{50}$$
5) $$0,256 = \frac{256}{1000} = \frac{32}{125}$$
6) $$0,3264 = \frac{3264}{10000} = \frac{204}{625}$$