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F(x)=|1-x|+ |1-2x| +|1-3x|+ |1-4x|+ |1-5x|+ |1-6x|+ |1-7x|+ |1-8x|+ |1-9x|+ |1-10x| 當 x= b/a 時,有最小值 d/c , 求 a,b,c,d 的值.

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