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sabakurban
@sabakurban
July 2022
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аn арифметическая прогресия, в которой а3=2.3 а8 =-0.8 тогда а1 будет равно : А) 2.7 В)2.8 С)-2.6 Д)-2.9 Е)-2.8
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ShirokovP
Verified answer
A1 + 2d = 2,3
a1 + 7d = - 0,8
a1 = 2,3 - 2d
2,3 - 2d + 7d = - 0,8 *
a1 = 2,3 - 2d
5d = - 3,1
a1 = 2,3 - 2*(-0.62) = 3,54
d = - 0,62
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ShirokovP
проверьте условие еще раз
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Answers & Comments
Verified answer
A1 + 2d = 2,3a1 + 7d = - 0,8
a1 = 2,3 - 2d
2,3 - 2d + 7d = - 0,8 *
a1 = 2,3 - 2d
5d = - 3,1
a1 = 2,3 - 2*(-0.62) = 3,54
d = - 0,62