Question

1 x=2 la puterea 0 +2 la puterea 1+... 2 la 1000

2 Arata ca. A=1977+2 x (112+ ....+9976 este patrat perfect

Answer 1

1. avem o progresie geometrica
x=b1*$\frac{ q^{n}-1 }{q-1}$
b1=2^0=1
q=2
x=$1* \frac{2 ^{100}-1 }{900} =\frac{2 ^{100}-1 }{900}$