χ²-χ/2(χ+1)+χ/3(χ-1)+χ/6(χ-2)
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χ²-χ/2(χ+1)+χ/3(χ-1)+χ/6(χ-2)χ²-χ/2(χ+1)+χ/3(χ-1)+χ/6(χ-2)χ²-χ/2(χ+1)+χ/3(χ-1)+χ/6(χ-
χ²-χ/2(χ+1)+χ/3(χ-1)+χ/6(χ-2)
χ²-χ/2(χ+1)+χ/3(χ-1)+χ/6(χ-2)
χ²-χ/2(χ+1)+χ/3(χ-1)+χ/6(χ-2)
χ²-χ/2(χ+1)+χ/3(χ-1)+χ/6(χ-2)
=[3(x²-x)(x-1)(x-2)+2x(x+1)(x-2)+x(x+1)(x-1)]/[6(x+1)(x-1)(x-2)]
=(3x^4-12x³+15x²-6x+2x³--2x²-4x+x³-x)/[6(x+1)(x-1)(x-2)]
=(3x^4-9x³-13x²-11x)/(6x³-12x²-6x+12)