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Lonely07
@Lonely07
January 2020
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Uma PA tem a1= -9 e r=7 . Determine seus 6 primeiros termos e calcule a soma deles.
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baebergamota
Verified answer
A1=-9
r=7
a2=-9+(2-1).7=-9+1.7=-9+7=-2
a3=-9+(3-1).7=-9+2.7=-9+14=5
a4=-9+(4-1).7=-9+3.7=-9+21=12
a5=-9+(5-1).7=-9+4.7=-9+28=19
a6=-9+(6-1).7=-9+5.7=-9+35=26
S6= (-9+26).6/2
S6=17.6/2
S6=102/2
S6=51
6 votes
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Verified answer
A1=-9r=7
a2=-9+(2-1).7=-9+1.7=-9+7=-2
a3=-9+(3-1).7=-9+2.7=-9+14=5
a4=-9+(4-1).7=-9+3.7=-9+21=12
a5=-9+(5-1).7=-9+4.7=-9+28=19
a6=-9+(6-1).7=-9+5.7=-9+35=26
S6= (-9+26).6/2
S6=17.6/2
S6=102/2
S6=51