Ответ:
a10=-16+3*9
a10=-16+27
a10=11
S10=(-16+11)/2*10
S10=-5*5
S10=-25
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Ответ:
a10=-16+3*9
a10=-16+27
a10=11
S10=(-16+11)/2*10
S10=-5*5
S10=-25