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计算 3x+4y/x-y+3y/y-x-4x/x-y

分类: 作业答案 • 2021-12-19 15:53:38
问题描述：

计算 3x+4y/x-y+3y/y-x-4x/x-y

答

原式=(3x+4y)/(x-y)-3y/(x-y)-4x/(x-y)
=(3x+4y-3y-4x)/(x-y)
=(-x+y)/(x-y)
=-(x-y)/(x-y)
=-1

答

=(3x+4y)/(x-y)-3y/(x-y)-4x/(x-y)
=(3x+4y-3y-4x)/(x-y)
=(-x+y)/(x-y)
=-(x-y)/(x-y)
=-1

答

3x+4y/x-y+3y/y-x-4x/x-y
=(3x+4y)/(x-y)-3y/(x-y)-4x/(x-y)
=(3x+4y-3y-4x)/(x-y)
=(y-x)/(x-y)
=-1

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