计算：[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1)
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[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1)
=[(y+1)/(y-1)(y-3)减去(y-2)/(y-3)^2]除以(y-5)/(y-1)
=[(y+1)(y-3)/(y-1)(y-3)^2减去(y-2)(y-1)/(y-1)(y-3)^2]除以(y-5)/(y-1)
=(y-5)/(y-1)(y-3)^2除以(y-5)/(y-1)
=(y-5)/(y-1)(y-3)^2乘以（y-1）/(y-5)
=1/(y-3)^2
=[(y+1)/(y-1)(y-3)减去(y-2)/(y-3)^2]除以(y-5)/(y-1)
=[(y+1)(y-3)/(y-1)(y-3)^2减去(y-2)(y-1)/(y-1)(y-3)^2]除以(y-5)/(y-1)
=(y-5)/(y-1)(y-3)^2除以(y-5)/(y-1)
=(y-5)/(y-1)(y-3)^2乘以（y-1）/(y-5)
=1/(y-3)^2
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