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KAPORETTO
@KAPORETTO
July 2022
1
12
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Арифметическая прогрессия.
а8=12
а10=15
а4=?
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Answers & Comments
IrkaShevko
Verified answer
A10 = a1 + 9d
a8 = a1 + 7d
a10 - a8 = 2d = 15 - 12 = 3
d = 1,5
a1 = 12 - 7*1,5 = 12 - 10,5 = 1,5
a4 = a1 + 3d = 1,5 + 3*1,5 = 1,5 + 4,5 = 6
Ответ: 6
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Answers & Comments
Verified answer
A10 = a1 + 9da8 = a1 + 7d
a10 - a8 = 2d = 15 - 12 = 3
d = 1,5
a1 = 12 - 7*1,5 = 12 - 10,5 = 1,5
a4 = a1 + 3d = 1,5 + 3*1,5 = 1,5 + 4,5 = 6
Ответ: 6