2^(2k - 1) * 3^(2k-1) = 6 ^ (2k - 1)
6 ^(2k - 2) = 6^(2k - 1) / 6
Итого :
2^(2k-1)*3^(2k-1)/12*6^(2k-2) = 6^(4k - 2)/ 12 = 6^(4k - 3) / 2
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2^(2k - 1) * 3^(2k-1) = 6 ^ (2k - 1)
6 ^(2k - 2) = 6^(2k - 1) / 6
Итого :
2^(2k-1)*3^(2k-1)/12*6^(2k-2) = 6^(4k - 2)/ 12 = 6^(4k - 3) / 2