Đề bài

Sắp xếp các số sau theo thứ tự tăng dần:

a) ${\left( {\dfrac{{22}}{{21}}} \right)^{18}};{\rm{ }}{\left( {\dfrac{{22}}{{21}}} \right)^{21}};{\rm{ }}{\left( {\dfrac{{22}}{{21}}} \right)^{20}};{\rm{ }}{\left( {\dfrac{{22}}{{21}}} \right)^{22}};{\rm{ }}\dfrac{{22}}{{21}}$;

b) ${(0,1)^{21}};{\rm{ (}} - {\rm{0,1}}{{\rm{)}}^{20}};{\rm{ (0,1}}{{\rm{)}}^{22}};{\rm{ (}} - 0,1{)^{19}};{\rm{ 0}}$.