При каких значениях a верно равенство?


а) [tex]\sqrt[]{a^2}=-a[/tex]

б) [tex]\sqrt[3]{a^3} = a[/tex]

в) [tex]\sqrt[5]{a^5} =|a|[/tex]

г) [tex]\sqrt[4]{a^4} =a[/tex]

д) [tex]\sqrt[3]{a^3} =-a[/tex]

е) [tex]\sqrt[6]{a^6} =-a[/tex]

ж) [tex]\sqrt[4]{a^4} =|a|[/tex]

з) [tex]\sqrt[7]{a^7} =a[/tex]
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