Respostas

2013-03-13T18:22:38-03:00

(x-r)+x+(x+r)=24
(x-r).x.(x+r)=440

3x+0=24
x=8

(8-r).8.(8+r)=440
(64-8r).(8+r)=440
(512-64r)+(64r-8r²)=440
512-8r²=440
512-440=8r²
72=8r²
r²=72/8
r²=9
r=3
PA: (8-3), 8, (8+3)
......5, 8, 11

3 3 3