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20 12 Jiangsu college entrance examination math problem 14 how to solve without images?
(solution: 5c-3a < = b <; =4c-a，cInb & gt= a+cInc； Let c=ka(k is a positive real number), then there is 5ka-3a.

Relatives (b/ka)>= 1 deduction (b/ka)>= 1/k, (0<k & lt=2), then 1/k=m (then 1/2

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