Предмет: Алгебра, автор: таша45

третий член арифм ппогрессии равен 6.а пятый равен 10 найдите член первый. а)1;б)2;в)-1;г)0

Ответы

Автор ответа: Lesben

a5 = a3+2d, 2d = a5-a3, 2d = 10-6=4, d=2
a1 = a3 -2d = 6 - 4 = 2, a1 = 2

Автор ответа: таша45

это как

Автор ответа: Lesben

Icpolzuetsja formula: an = am+(m-n).d

Автор ответа: таша45

ответ то какой? вот какой буквой?... у меня кр ((((

Автор ответа: Lesben

Btoraja bukva!

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