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Biuta1284739
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calculati 1+2+2la a 2a +.....2la 15
5la 0 +5la 1+.....+5la 10

Răspuns :

a=2^0+2^1+2^2+....+2^15|×2
2a=2^1+2^2+..........+2^16
2a-a=2^16-1
a=2^16-1
b=5^0+5^1+.......+5^10|×5
5b=5^1+5^2+.......+5^11
5b-b=5^11-1
4b=5^11-1
b=(5^11-1)/4

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