(a + b) : (b + c) : (a + c) = 6 : 5 : 9, మరియు (a + b + c) = 40, అప్పుడు (a2 + b2 + c2) : (a2 + b2 - c2)

1
18 : 7
2
21 : 5
3
5 : 3
4
12 : 5

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