12.x∈(1/8,1/7),求|1
12.x∈(1/8,1/7),求|1-2x|+|1-3x|+|1-4x|+...+|1-10x|的值 13.2x^4-x^3-6x^2-x+2因式分解为(2x-1)q(x),求q(x)
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