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Danic20036
@Danic20036
August 2022
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Найдите первый член и разность арифметической прогрессии, если а3=25 а10=-3. С РЕШЕНИЕМ
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Evgenia4836
Verified answer
A3=a1+2d
a10=a1+9d
25=a1+2d
-3=a1+9d
a1=25-2d
a1=-3-9d
25-2d=-3-9d
25+3=-9d+2d
28=-7d
d=-4
a1=25+8=33
1 votes
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Answers & Comments
Verified answer
A3=a1+2da10=a1+9d
25=a1+2d
-3=a1+9d
a1=25-2d
a1=-3-9d
25-2d=-3-9d
25+3=-9d+2d
28=-7d
d=-4
a1=25+8=33