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b=(16^27+8^36+64^18)^400:64^7200
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Răspuns :

16^27=(2^4)^27=2^108
8^36=(2^3)^36=2^108
64^18=(2^6)^18=2^108
64^7200=(2^6)^7200=2^43200

Deci B=(2^108+2^108+2^108)^400:2^43200=(3*2^108)^400:2^43200=3^400*2^43200:2^43200=3^400.

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