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MaksimKort
@MaksimKort
August 2021
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Найти сумму первых сорока членов арифметической прогрессии (an);- -42,5; -40;..
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alisher270502
A1=-42,5
a2=-40
d=a2-a1=-40-(-42,5)=2,5
a40=a1+39d=-42,5+39*2,5=55
s40=(a1+a40)/2 *40=(-42,5+55)*20=250
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Answers & Comments
a2=-40
d=a2-a1=-40-(-42,5)=2,5
a40=a1+39d=-42,5+39*2,5=55
s40=(a1+a40)/2 *40=(-42,5+55)*20=250