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7 la puterea 7+7 la puterea 5+7 la puterea 5

Răspuns :

7+7+7⁵=
=7⁵(7²+1+1)
=7⁵(49+2)
=51×7⁵
7^7+7^5+7^5=7^7+2×7^5=7^5×(7^2+2)=7^5×(49+2)=7^5×51