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SlIa
@SlIa
May 2021
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СРОЧНО НУЖЕН ОТВЕТ !!!!!!!!!!!!!!!!!!!!
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Answers & Comments
Pacanka202
1. q=b2/b1=-20/(-25)=4/5
b4=b1•q^3=(-25•64)/125=-64/5=-12,8
2. b1=-3; bn+1=6bn
q=6
b1•(q^4–1) -3•1295
S4 = --------------- = ------------ = –777
q–1 5
3. q=b2/b1=-252/1512=-1/6
b1•(q^4–1) 1512•(-1295/1296)
S4 = --------------- = ------------------------- =
q–1 –7/6
= (-7•1295•6)/(-6•7) = 1295
4. bn=3•2^(n-1)
b3=3•2^2=12
5. b1=–128; bn+1=1/2 bn
q=1/2
b7=b1•q^6=-128•1/64=–2
6. b1+b2=75; b2+b3=150
b1•q+b1•q^2=150
b1+b1•q=75
b1•q(1+q)=150
b1(1+q)=75
Разделим первое уравнение на второе:
q=2
b1=75/(1+q)=75/3=25
b2=b1•q=25•2=50
b3=b1•q^2=25•4=100
Ответ: 25; 50; 100
7. b1+b2=48; b2+b3=144
b1•q+b1•q^2=144
b1+b1•q=48
b1•q(1+q)=144
b1(1+q)=48
Разделим первое уравнение на второе:
q=3
b1=48/(1+q)=12
b2=b1•q=12•3=36
b3=b1•q^2=12•9=108
Ответ: 12; 36; 108
8. q=b2/b1=-256/(-1024)=1/4
b1•(q^5–1) -1024•(-1023/1024)
S5 = --------------- = ---------------------------
q–1 3/4
= (1023•4)/3=1364
9. b1=2; q=-2
b5=b1•q^4=2•16=32
2 votes
Thanks 1
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Answers & Comments
b4=b1•q^3=(-25•64)/125=-64/5=-12,8
2. b1=-3; bn+1=6bn
q=6
b1•(q^4–1) -3•1295
S4 = --------------- = ------------ = –777
q–1 5
3. q=b2/b1=-252/1512=-1/6
b1•(q^4–1) 1512•(-1295/1296)
S4 = --------------- = ------------------------- =
q–1 –7/6
= (-7•1295•6)/(-6•7) = 1295
4. bn=3•2^(n-1)
b3=3•2^2=12
5. b1=–128; bn+1=1/2 bn
q=1/2
b7=b1•q^6=-128•1/64=–2
6. b1+b2=75; b2+b3=150
b1•q+b1•q^2=150
b1+b1•q=75
b1•q(1+q)=150
b1(1+q)=75
Разделим первое уравнение на второе:
q=2
b1=75/(1+q)=75/3=25
b2=b1•q=25•2=50
b3=b1•q^2=25•4=100
Ответ: 25; 50; 100
7. b1+b2=48; b2+b3=144
b1•q+b1•q^2=144
b1+b1•q=48
b1•q(1+q)=144
b1(1+q)=48
Разделим первое уравнение на второе:
q=3
b1=48/(1+q)=12
b2=b1•q=12•3=36
b3=b1•q^2=12•9=108
Ответ: 12; 36; 108
8. q=b2/b1=-256/(-1024)=1/4
b1•(q^5–1) -1024•(-1023/1024)
S5 = --------------- = ---------------------------
q–1 3/4
= (1023•4)/3=1364
9. b1=2; q=-2
b5=b1•q^4=2•16=32