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jawab

(a +b) / (a- b) = 1/5

misal
a + b =  x
a- b =  5x
.................+
2a = 6x
a = 3x --> a^2 = 9x^2
b = - 2x --> b^2 = 4x^2

(a^2 - b^2)  ; (a^2 +b^2)
= 5x^2 : 13x^2

= 5 :.13