a) $\frac{22}{21}; (\frac{22}{21})^{18}; (\frac{22}{21})^{20}; (\frac{22}{21})^{21}; (\frac{22}{21})^{22};$
b) $(-0.1)^{19}; 0; (0.1)^{22}; (0.1)^{21}; (-0.1)^{20}.$
a) $\frac{22}{21}; (\frac{22}{21})^{18}; (\frac{22}{21})^{20}; (\frac{22}{21})^{21}; (\frac{22}{21})^{22};$
b) $(-0.1)^{19}; 0; (0.1)^{22}; (0.1)^{21}; (-0.1)^{20}.$