Предмет: Алгебра, автор: msastapovich

Найдите разность ариф. прогрессии,если а11-а4=12,6

an602: a1+10d-a1-3d=12,6 значит, d=1,8

msastapovich: jоткуда взялась формула?откуда 10, 3?

Ответы

Автор ответа: People15

а1+10d-(a1+3d)=12.6
a1+10d-a1-3d=12.6
7d=12.6
d=1.8

msastapovich: так откуда взялась первая строчка?)я этого понять не могу, 10d и 3d. можно на этом моменте подробнее?

Автор ответа: julyap

$a _{11} -a _{4} =12.6 \\ a _{1} +10d-a _{1} -3d=12.6\\10d-3d=12.6\\7d=12.6\\d=1.8$

msastapovich: так откуда взялась первая строчка9после условия)?)я этого понять не могу, 10d и 3d. можно на этом моменте подробнее

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