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∵ a b = c d = e f = 5 7 ∴ a b = 2c 2d = 3e 3f ∴ a+2c+3e b+2d

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∵ a b = c d = e f = 5 7 ∴ a b = 2c 2d = 3e 3f ∴ a+2c+3e b+2d
∵ a b = c d = e f = 5 7 ∴ a b = 2c 2d = 3e 3f ∴ a+2c+3e b+2d+3f = 5 7 .