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bondara273
@bondara273
August 2022
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Найдите сумму семнадцати первых членов арифметической прогрессии: -16; -10; -4; ...
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acar
Verified answer
S17=(2a1+d(n-1)/2 *n
a1=-16
d=6
S17=(-32+6*16)/2 *17=32*17=544
2 votes
Thanks 10
slnadezda
B1=-16, d=6
S17=(b1+8d)*17=(-16+48)*17=32*17=544
1 votes
Thanks 3
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Verified answer
S17=(2a1+d(n-1)/2 *na1=-16
d=6
S17=(-32+6*16)/2 *17=32*17=544
S17=(b1+8d)*17=(-16+48)*17=32*17=544