Предмет: Алгебра, автор: evdosektana3773

7 завдання.Терміново,будьласкааа

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Автор ответа: rina4972
0
d=30; a₁=-207
Система уравнений:
a₅+a₁₂=36; a₁+4d+a₁+11d=36; 2a₁+15d=36
a₃+a₁₃=6; a₁+2d+a₁+12d=6; 2a₁+14d=6
2a₁+15d-2a₁-14d=36-6
d=30 - разность арифметической прогрессии.
2a₁+14d=6 |2
a₁+7d=3; a₁=3-7d=3-7·30=3-210=-207 - 1-й член арифметической прогрессии.
Извини если не правильно :(
Автор ответа: Аноним
0

Було погано видно спочатку . Тепер вірно.

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