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MarieMary1
@MarieMary1
July 2022
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a1+a5=18 a2+a3=12 сумма первых 10 чисел последовательности
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aasassin
Б) a1 и d, если a2=7 a3=4
a2 = a1+d
a3 = a1+2d
a3-a2 = 4-7 = d
d=-3
a1=a2-d = 7-(-3) = 7+3 = 10
Ответ:
a1 = 10, d = -3
в) a5 и d, если a6=8 a4=12
a6 = a4+2d
8 = 12+2d
2d = -12+8
2d = -4
d=-2
a5-2 = 8
a5 = 10
г) a7 и d, если a6=-15 a8=-11
a8 = a6+2d
-15+2d = -11
2d = -11+15 = 4
d=2
a7 = -15+2 = -13
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MarieMary1
это вместе идет
MarieMary1
срочно!!!
MarieMary1
5 минут.....
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Answers & Comments
a2 = a1+d
a3 = a1+2d
a3-a2 = 4-7 = d
d=-3
a1=a2-d = 7-(-3) = 7+3 = 10
Ответ: a1 = 10, d = -3
в) a5 и d, если a6=8 a4=12
a6 = a4+2d
8 = 12+2d
2d = -12+8
2d = -4
d=-2
a5-2 = 8
a5 = 10
г) a7 и d, если a6=-15 a8=-11
a8 = a6+2d
-15+2d = -11
2d = -11+15 = 4
d=2
a7 = -15+2 = -13