[tex]a^{-21} *a^{20} :a^{-40} =a^{-1} :a^{-40} =a^{39}[/tex]
Объяснение:
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[tex]a^{-21} *a^{20} :a^{-40} =a^{-1} :a^{-40} =a^{39}[/tex]
Объяснение: