[(xy+2)(xy+2)-2(xy+1)+2]÷(xy)
=[(xy+2)(xy+2)-2xy-2+2]÷(xy)
=[(xy+2)(xy+2)-2xy]÷(xy)
=[(xy)^2+4xy+4-2xy]÷(xy)=[(xy)^2+2xy+4]÷(xy)
根据题意可知,x,y均不为0
所以,上式=xy+2+4/xy
因为xy=-0.4,带入得原式=-8.4
[(xy+2)(xy+2)-2(xy+1)+2]÷(xy)
=[(xy+2)(xy+2)-2xy-2+2]÷(xy)
=[(xy+2)(xy+2)-2xy]÷(xy)
=[(xy)^2+4xy+4-2xy]÷(xy)=[(xy)^2+2xy+4]÷(xy)
根据题意可知,x,y均不为0
所以,上式=xy+2+4/xy
因为xy=-0.4,带入得原式=-8.4