{（xy-2）^2+4xy-4}/(-xy)
={(xy-2)^2+2(xy-2)+1+2xy-1}/(-xy)
={[(xy-2)+1]^2+2xy-1}/(-xy)
={(xy-1)^2+2xy-1}/(-xy)
={(xy)^2-2xy+1+2xy-1}/(-xy)
=(xy)^2/(-xy)
=-xy
=-1*(-1/25)
=1/25
[(xy-2)²+4xy-4]/(-xy)
=(x²y²-4xy+4+4xy-4]/(-xy)
=-xy
=-1×(-1/25)
=1/25
望采纳
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