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lytnevadarya
@lytnevadarya
August 2022
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Найдите значение суммы первых пяти членов арифметической прогрессии, если а2+а4=3.4
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sedinalana
Verified answer
A2=a4=3,4
a1+d+a1+3a=3,4
2a1+4d=3,4
S5=(2a1+4d)*5/2
S5=3,4*5/2=1,7*5=8,5
13 votes
Thanks 26
feeyzer
Спасибо большое)))
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Verified answer
A2=a4=3,4a1+d+a1+3a=3,4
2a1+4d=3,4
S5=(2a1+4d)*5/2
S5=3,4*5/2=1,7*5=8,5