2x-2/ x²-3x+2-x+2/x²-x-6+3-x/x四次方-4x+3
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2x-2/ x²-3x+2-x+2/x²-x-6+3-x/x四次方-4x+3
先约分再通分.
先约分再通分.
2x-2/ x²-3x+2-x+2/x²-x-6+3-x/x2次方-4x+3
=2(x-1)/(x-1)(x-2)-(x+2)/(x+2)(x-3))-(x-3)/(x-3)(x-1)
=2/(x-2)-1/(x-3)-1/(x-1)
=【2(x-3)(x-1)-(x-2)(x-1)-(x-2)(x-3)]/(x-1)(x-2)(x-3)
=(2x^2-8x+6-x^2+3x-2-x^2+5x-6)/(x-1)(x-2)(x-3)
=-2/(x-1)(x-2)(x-3)
=2(x-1)/(x-1)(x-2)-(x+2)/(x+2)(x-3))-(x-3)/(x-3)(x-1)
=2/(x-2)-1/(x-3)-1/(x-1)
=【2(x-3)(x-1)-(x-2)(x-1)-(x-2)(x-3)]/(x-1)(x-2)(x-3)
=(2x^2-8x+6-x^2+3x-2-x^2+5x-6)/(x-1)(x-2)(x-3)
=-2/(x-1)(x-2)(x-3)
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