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:
1 4 1 4 4 16 64 1024 ( )
4
.1
4
:( )
991 + 993 + 995 + 997 + 999
= (1000 − 9) + (1000 − 7) + (1000 − 5) + (1000 − 3) + (1000 − 1)
= 5000 − (9 + 7 + 5 + 3 + 1)
= 5000 − 25
5000 − 25 = 5000 − N :( ) ()
N = 25
.a,b < 0
.b a
a,b > 0
b = −2 a = −24
. a = −24 = 12
b −2
:( ) ()
n
x x n k
k
46 = 15 3 .
3