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nadibodlak2
@nadibodlak2
July 2022
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дуже треба (до понеділка)БУДЬ ЛАСКА
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математик2011
А1
1.
аⁿ = а₁+d(n-1)
aⁿ = 2,4 - 0,8(n-1)
a₁₁ = 2,4-0,8(11-1) = 2,4 - 0,8*10 = 2,4 - 8 = - 5,6
2.
c₅ = c₁+4d
d = (c₅ - c₁)/4
d = (-0,4 - (-1,2))/4 = (-0,4+1,2)/4 = 0,8/4 = 0,2
3.
a₁₁ = a₁+10d
a₆ = a₁+5d
a₁₁ - a₆ = 10d-5d
a₁₁ - a₆ = 5d
d = (a₁₁ - a₆)/5
d = (48 - 23)/5 = 25/5 = 5
4.
n=8
Б-1
1.
d = -21 - (-22,5) = 1,5
a₁₁ = -22,5+1,5*10 = -22,5+15 = -7,5
2.
d = (a₇ - a₄)/3 = (0,6 - 1,8)/3 = -1,2/3 = -0,4
a₁+4*(-0,4) = 1,8
a₁ = 1,8+1,6
a₁ = 3,4
3.
a₁+3*2 = -2
a₁ = -2-6
a₁ = -8
-8+3(n-1) = 22
3(n-1) = 30
n-1 = 10
n = 11
4.
11n - 78>0
11n>78
n>7 1/11
n=8
В-1
1.
62+14*10 = 62+140=202
2.
1 votes
Thanks 1
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Answers & Comments
1.
аⁿ = а₁+d(n-1)
aⁿ = 2,4 - 0,8(n-1)
a₁₁ = 2,4-0,8(11-1) = 2,4 - 0,8*10 = 2,4 - 8 = - 5,6
2.
c₅ = c₁+4d
d = (c₅ - c₁)/4
d = (-0,4 - (-1,2))/4 = (-0,4+1,2)/4 = 0,8/4 = 0,2
3.
a₁₁ = a₁+10d
a₆ = a₁+5d
a₁₁ - a₆ = 10d-5d
a₁₁ - a₆ = 5d
d = (a₁₁ - a₆)/5
d = (48 - 23)/5 = 25/5 = 5
4.
n=8
Б-1
1.
d = -21 - (-22,5) = 1,5
a₁₁ = -22,5+1,5*10 = -22,5+15 = -7,5
2.
d = (a₇ - a₄)/3 = (0,6 - 1,8)/3 = -1,2/3 = -0,4
a₁+4*(-0,4) = 1,8
a₁ = 1,8+1,6
a₁ = 3,4
3.
a₁+3*2 = -2
a₁ = -2-6
a₁ = -8
-8+3(n-1) = 22
3(n-1) = 30
n-1 = 10
n = 11
4.
11n - 78>0
11n>78
n>7 1/11
n=8
В-1
1.
62+14*10 = 62+140=202
2.