Respostas

2014-04-11T14:11:24-03:00
a_{3} + a_{7} =324a_{1}+2r+a_{1}+6r=3242.a_{1}+8r=324

a_{11} = 3.a_{4}a_{1} +10r= 3.(a_{1}+3r)a_{1} +10r= 3.a_{1}+9r2.a_{1} = r

a_{1} + a_{2} + a_{3}= ?

2.a_{1}+8r=324r+8r=3249r=324r=362.a_{1} = 36 a_{1} = 18

a_{2} = a_{1} + r=18+36=54

a_{3} = a_{1} + 2r=18+72=90

a_{1} + a_{2} + a_{3}= 162


1 5 1