Предмет: Математика, автор: Luckyboy4

решите пожалуйста, надо найти
a1*a2

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Автор ответа: snow99

$a5 + a6 = 36 \\ a15 = 37 \\ \\ a1 + 4d + a1 + 5d = 36 \\ a1 + 14d = 37 \\ \\ 2a1 + 9d = 36 \\ a1 + 14d = 37 \\ \\ 2a1 + 9d = 36 \\ 2a1 + 28d = 74 \\ \\ 19d = 38 \\ a1 = 37 - 14d \\ \\ d = 2 \\ a1 = 37 - 14 \times 2 = 37 - 28 = 9 \\ \\ a2 = a1 + d = 9 + 2 = 11 \\ \\ a1 \times a2 = 9 \times 11 = 99$

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