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rapgirl99
@rapgirl99
June 2022
1
8
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а1+а3=8
а5-а2=3
найти: а7
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niitoochkaa
А1+а3=8,
а1+(а1+2d)=8,
2а1+2d=8,
а1=4-d.
а5-а2=3
аналогично записываем через а1 и d:
а5=а1+4d
а2=а1+d
a1+4d-(a1+d)=3
a1+4d-a1-d=3
d=1
a1=4-d=4-1=3
a7=a1+6d=3+6*1=9
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Answers & Comments
а1+(а1+2d)=8,
2а1+2d=8,
а1=4-d.
а5-а2=3
аналогично записываем через а1 и d:
а5=а1+4d
а2=а1+d
a1+4d-(a1+d)=3
a1+4d-a1-d=3
d=1
a1=4-d=4-1=3
a7=a1+6d=3+6*1=9