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kiera9231
@kiera9231
July 2022
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Дана арифметическая прогрессия, разность которой равна -2,5, a1= -9,1. Найдите сумму первых 15 её членов.
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Lesben
A1=-9,1, d=-2,5,s15=?
a15=a1+14d, a15=-9,1+14.(-2,5)=-9,1-35=-44,1
s15=15(a1+a15)/2,s15=15(-9,1-44,1)/2=
=15(-53,2)/2=15.(-26,6)=-399
s15=-399
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Answers & Comments
a15=a1+14d, a15=-9,1+14.(-2,5)=-9,1-35=-44,1
s15=15(a1+a15)/2,s15=15(-9,1-44,1)/2=
=15(-53,2)/2=15.(-26,6)=-399
s15=-399