Urgenteee!!!!
progressão
(n - r), n, (n + r)
soma
n - r + n + n + r = 3n = 21
n = 7
produto
(7 - r)*7*(7 + r) = 315
(7 - r)*(7 + r) = 45
49 - r² = 45
r² = 49 - 45 = 4
r = 2
(n - r) = 7 - 2 = 5
(n + r) = 7 + 2 = 9
(5,7,9)
pronto
(x-r)+x+(x+r)=21
3x=21
x=31/3
x=7
(7-r)*7*(7+r)=315
(7-r)(7+r)=315/7
49-r²=45
-r²=45-49
-r²=-4
r²=4
r=2
x-r=
7-2=5
x+r=
7+2=9
responde a minha
http://br.answers.yahoo.com/question/index?qid=201...
Copyright © 2024 1QUIZZ.COM - All rights reserved.
Answers & Comments
Verified answer
progressão
(n - r), n, (n + r)
soma
n - r + n + n + r = 3n = 21
n = 7
produto
(7 - r)*7*(7 + r) = 315
(7 - r)*(7 + r) = 45
49 - r² = 45
r² = 49 - 45 = 4
r = 2
progressão
(n - r) = 7 - 2 = 5
n = 7
(n + r) = 7 + 2 = 9
(5,7,9)
pronto
(x-r)+x+(x+r)=21
3x=21
x=31/3
x=7
(7-r)*7*(7+r)=315
(7-r)(7+r)=315/7
49-r²=45
-r²=45-49
-r²=-4
r²=4
r=2
x-r=
7-2=5
x=7
x+r=
7+2=9
(5,7,9)
responde a minha
http://br.answers.yahoo.com/question/index?qid=201...