1/2x-(x+y/2x -x-y)÷(x+y)

问题描述:

1/2x-(x+y/2x -x-y)÷(x+y)

1/2x-(x+y/2x -x-y)÷(x+y)
=1/2x-1/2x -x-y
=1/2x-1/x-y
=x-y/2x(x-y)-2x/2x(x-y)
=x-y-2x/2x(x-y)
=y-x/2x(x-y)
=﹣x-y/2x(x-y)
=﹣1/2x

应该是对的,望采纳

1/2x-(x+y/2x -x-y)÷(x+y)
=1/2x-[(x+y)/2x]÷(x+y)+(x+y)÷(x+y)
=1/2x-1/2x+1
=1
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