Предмет:
МатематикаАвтор:
анонимСумму первых пяти членов геометрической прогрессии вычислим по формуле:
S5 = b1 * (1 – q^5)/(1 – q).
Так как b2 = b1 * q, следовательно, первый член геометрической прогрессии b1 = b2/q = ¼.
Подставим значения первого члена и знаменателя прогрессии в формулу суммы:
S5 = 1/4 * (1 – (4)^5)/(1 – 4) = - 1/ 3 * (1 – 1024) = 1023/12 = 85.25.
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vanessa0xveДобавить свой ответ
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1 At noon yesterday, the staft were having/are having their monthly meeting.
2 My father works/used to work as a laxi driver five years ago.
3 Did you arrive/Were you arriving at the airport on time?
4 Two hundred years ago, people travelled/had travelled abroad by ship.
5 The teacher was giving/gave the students a test when the principal came/was coming into the classroom.
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9 Did Arnold attend/Was Arnold attending the conference yesterday?
10 Amy was sitting/sat on the park bench while the children play/were playing.
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12 Conrad didn't use to socialise/socialised much two years ago.
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