Resposta:
S = 49,5
Explicação passo a passo:
[tex]PA(a_1;a_2;7,a_4,12;a_6)\\\\a_3+2r=a_5\\\\7+2r=12\\\\2r=12-7\\\\2r=5\\\\r=\frac{5}{2}\\\\a_1+2r=a_3\\\\a_1+2*\frac{5}{2}=7 \\\\a_1+5=7 \\\\a_2=7-5\\\\a_1=2\\\\r=\frac{5}{2}=2,5[/tex]
Para formar a PA basta somar, a partir do 1° termo, a razão r = 2,5.
PA(2; 4,5; 7; 9,5; 12; 14,5)
Somando todos os termosmos:
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Resposta:
S = 49,5
Explicação passo a passo:
[tex]PA(a_1;a_2;7,a_4,12;a_6)\\\\a_3+2r=a_5\\\\7+2r=12\\\\2r=12-7\\\\2r=5\\\\r=\frac{5}{2}\\\\a_1+2r=a_3\\\\a_1+2*\frac{5}{2}=7 \\\\a_1+5=7 \\\\a_2=7-5\\\\a_1=2\\\\r=\frac{5}{2}=2,5[/tex]
Para formar a PA basta somar, a partir do 1° termo, a razão r = 2,5.
PA(2; 4,5; 7; 9,5; 12; 14,5)
Somando todos os termosmos:
S = 49,5