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comparați numerele:1+2+2^2+2^3+2^4+2^5+2^6 cu2^7-1

Răspuns :

1+2+2^2+2^3+2^4+2^5+2^6 =1+2+4+8+16+32+64=127
2^7-1 =128-1=127
127=127