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81*7:3*5*2(steluta reprezinta la puterea)

Răspuns :

81⁷=(3⁴)⁷=3⁴ˣ⁷=3²⁸
[tex]3 ^{5 ^{2} } =3 ^{25} [/tex]
3²⁸:3²⁵=3²⁸⁻²⁵=3³=27
[tex] 81^{7}:(3^{5})^{2}=[/tex]
[tex] 81= 3^{4} \\ \\ 81^{7}=(3^{4})^{7}=3^{28} \\ \\ (3^{5})^{2} = 3^{25}\\ \\3^{28} :3^{25} =3^{28-25} =3^{3}=27[/tex]

[tex] 81^{7}:(3^{5})^{2}=27[/tex]