Verified answer

Ответ:

[tex](b^{5} )^{4} *b^{5} :b^{4} =b^{5*4} *b^{5} :b^{4}=b^{20} *b^{5} :b^{4}=b^{20+5} :b^{4} =b^{25} :b^{4} =b^{25-4} =b^{21}[/tex]

или по действиям.

[tex]1)(b^{5})^{4}=b^{5*4} =b^{20}[/tex]

[tex]2)b^{20} *b^{5} =b^{20+5} =b^{25}[/tex]

[tex]3)b^{25} :b^{4} =b^{25-4} =b^{21}[/tex]