x/x-3-5x/x^2-x-6计算

来源：学生作业帮助网编辑：作业帮时间：2024/04/28 00:42:37

x/x-3-5x/x^2-x-6计算
x/x-3-5x/x^2-x-6计算

x/x-3-5x/x^2-x-6计算
原式=[x/(x-3)]-[5x/(x²-x-6)]
=[x/(x-3)]-(5x)/[(x-3)(x+2)]
=[x(x+2)]/[(x-3)(x+2)]-(5x)/[(x-3)(x+2)]
=(x²+2x-5x)/[(x-3)(x+2)]
=(x²-3x)/[(x-3)(x+2)]
=[x(x-3)]/[(x-3)(x+2)]
=x/(x+2)

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