x+(x-y)+1= 去括号 x-(x-y-1)

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x+(x-y)+1=去括号x-(x-y-1)x+(x-y)+1=去括号x-(x-y-1)x+(x-y)+1=去括号x-(x-y-1)x+(x-y)+1=x+x-y+1=2x-y+1x-(x-y-1)=

x+(x-y)+1= 去括号 x-(x-y-1)
x+(x-y)+1= 去括号 x-(x-y-1)

x+(x-y)+1= 去括号 x-(x-y-1)
x+(x-y)+1=x+x-y+1=2x-y+1
x-(x-y-1)=x-x+y+1=y+1

x-(y-x-1)