当x-y/x+y= -1/2时,求y-x/x+y -2x+2y/x-y的值.(要有过程)
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当x-y/x+y= -1/2时,求y-x/x+y -2x+2y/x-y的值.(要有过程)
当x-y/x+y= -1/2时,求y-x/x+y -2x+2y/x-y的值.(要有过程)
当x-y/x+y= -1/2时,求y-x/x+y -2x+2y/x-y的值.(要有过程)
由x-y/x+y=-1/2知 y-x/x+y=1/2 2x+2y/x-y=-4 所以 1/2-(-4)=9/2