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алина3798
алина3798
03.06.2023 08:43 •  Алгебра

( а н ): d = –5, а н = –8, S n = 145 учитывая арифметическую прогрессию. Найдите значение nя​

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Ответ:
гсооагвгв
гсооагвгв
03.06.2023

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Must Waste More Time...

4,8(58 оценок)
Ответ:
petrosiannikita
petrosiannikita
03.06.2023
Два тракториста вместе вспахали поле площадью 558 га.Первый тракторист работал 6 дней,а второй -8 дней.Сколько гектаров земли вспахивал каждый тракториств день,если первый за 4 дня вспахал столько же,сколько второй за 5 дней?

пусть 

 x   гектаров земли вспахивал первый тракторист в день,

у    гектаров земли вспахивал второй тракторист в день,

тогда
 
6x+8y=558           12x+16y=1116
4x=5y                    12 x-15y=0                   ⇒31y=1116  ⇒y=36   x=45

y=36  - гектаров земли вспахивал второй тракторист в день,
 
x=45 гектаров земли вспахивал первый тракторист в день.
4,5(83 оценок)
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