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serafimudovenk
@serafimudovenk
August 2022
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Помогите решить арифметическую прогрессию !
N(9.5) полностью
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SamBars
1)
a1 = -1
a4 = 8 a4 = a1 + 3d d = 3
a11 = 29 a11 = a1 + 10d d = 3
да являются
2)
a2 = 9
a6 = 17
a4 = ? a4 = (a3+a5)/2 = (a2+a6)/2 = (9 +17)/2 = 13 a4 = a2 + 2d d =2
a7 = ? a7 = a6 + d = 17 + 2 = 19
d = ? d = 2
S6 = ? S6 =(а1 + а6)*6/2 = (7 + 17) * 3 = 72
3)
a5 = 9
a9 = -3
a7 = ? a7 = (a5+a9)/2 = 3 a7 = a5 +2d d = -3
a4 = ? a5 = a4 + d a4 = 12
d = ? d = -3
a5 = a1 + 4d a1 = 21
a8 = 0
S8 = ? S8 = (a1 + a8)*8/2 = 21*4 = 84
4)
a3 = 0
a5 = 20
d = ?
a5 = a3 + 2d
d = 10
5)
S4 = 40
d = 4
a5 = ?
S4 = (2*a1 + 3*d)*4/2
20 = 2*a1 + 12
2a1 = 8
a1 = 4
a5 = a1 + 4d = 4 + 16 = 20
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Answers & Comments
a1 = -1
a4 = 8 a4 = a1 + 3d d = 3
a11 = 29 a11 = a1 + 10d d = 3
да являются
2)
a2 = 9
a6 = 17
a4 = ? a4 = (a3+a5)/2 = (a2+a6)/2 = (9 +17)/2 = 13 a4 = a2 + 2d d =2
a7 = ? a7 = a6 + d = 17 + 2 = 19
d = ? d = 2
S6 = ? S6 =(а1 + а6)*6/2 = (7 + 17) * 3 = 72
3)
a5 = 9
a9 = -3
a7 = ? a7 = (a5+a9)/2 = 3 a7 = a5 +2d d = -3
a4 = ? a5 = a4 + d a4 = 12
d = ? d = -3
a5 = a1 + 4d a1 = 21
a8 = 0
S8 = ? S8 = (a1 + a8)*8/2 = 21*4 = 84
4)
a3 = 0
a5 = 20
d = ?
a5 = a3 + 2d
d = 10
5)
S4 = 40
d = 4
a5 = ?
S4 = (2*a1 + 3*d)*4/2
20 = 2*a1 + 12
2a1 = 8
a1 = 4
a5 = a1 + 4d = 4 + 16 = 20