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marmerid
@marmerid
July 2022
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а5=126 а10=146 а9=?
арифметикическая прогрессия
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Lesben
A5=126, a10=146, a9=?
a10=a5+5d, 5d=a10-a5, 5d=146-126, 5d=20, d=4
d=4
a9=a1+8d
a5=a1+4d, a1=a5-4d, a1=126-4.4=126-16=110
a9=110+8.4, a9=110+32, a9=142
a9=142
======
(a9=a10-d=146-4=142)
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Answers & Comments
a10=a5+5d, 5d=a10-a5, 5d=146-126, 5d=20, d=4
d=4
a9=a1+8d
a5=a1+4d, a1=a5-4d, a1=126-4.4=126-16=110
a9=110+8.4, a9=110+32, a9=142
a9=142
======
(a9=a10-d=146-4=142)