Предмет: Алгебра, автор: Аноним

Знайдіть третій член арифметичної прогресії, якщо п’ятий їх член -9, а різниця 5?

-19

19

-29

Ответы

Автор ответа: Alina122443

0

a5=a1+5*4
{a3=a1+5*2

{-9=a1+20
{а3=а1+10
а1=-29

а3= -29+5*2= -19
Ответ: -19

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