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CarolCM2004
@CarolCM2004
May 2019
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Determine os valores de A e B na figura a seguir, sabendo que:
AB/AC = 4/9 e BC = 25cm
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GoldenFox
Obs: asteriscos representam multiplicação
AB/AC = 4/9 BC = 25
AB = b
AC = b + 25
substituindo:
b/(b+25) = 4/9
multiplicação em cruz (4*(b+25) e 9*b)
9b = 4b + 100
9b - 4b = 100
5b = 100
b = 100/5
b = 20
a = b + 25
a = 20 + 25
a = 45
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CarolCM2004
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AB/AC = 4/9 BC = 25
AB = b
AC = b + 25
substituindo:
b/(b+25) = 4/9
multiplicação em cruz (4*(b+25) e 9*b)
9b = 4b + 100
9b - 4b = 100
5b = 100
b = 100/5
b = 20
a = b + 25
a = 20 + 25
a = 45