八年级数学分式题
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x/(xy+x+1) + y/(yz+y+1) + z/(zx+z+1)
=xz/(yzx+xz+z) + y/(yz+y+1) + z/(zx+z+1)
=xz/(1+xz+z) + y/(yz+y+1) + z/(zx+z+1)
=(xz+z)/(zx+z+1) + y/(yz+y+1)
=(xyz+yz)/(xyz+yz+y) + y/(yz+y+1)
=(1+yz)/(1+yz+y) + y/(yz+y+1)
=(yz+y+1)/(yz+y+1)
=1
=xz/(yzx+xz+z) + y/(yz+y+1) + z/(zx+z+1)
=xz/(1+xz+z) + y/(yz+y+1) + z/(zx+z+1)
=(xz+z)/(zx+z+1) + y/(yz+y+1)
=(xyz+yz)/(xyz+yz+y) + y/(yz+y+1)
=(1+yz)/(1+yz+y) + y/(yz+y+1)
=(yz+y+1)/(yz+y+1)
=1
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