Question

2)Sa se restranga sumele:​

Answer 1

Răspuns:

2^10(10+1)/2

2^10×11/2

2^5×11

2^55

2^50×(50+1)/2

2^50×51/2

2^25×51

2^1275

4^10(10+1)/2

4/10×11/2

4^5×11

4^55

5^100×(100+1)/2

5^100×101/2

5^50×101

=5^5050

2^2013(2013+1)/2

2^2013×2013/2

2^2013×1007

2^2.027.091

2^0=1

deoarece e 0,nici un termen nu e valid

deci,2^0=1 mereu

chiar daca faci 2^0(0+1)/2

da 2^0×1/2

ce e 2^0/2*2^0:2,0:2 fiind 0)

ce e 2^0

egal cu 1