由y=y1+y2,其中y1=k1x,y2=k2/x
代入:y=k1x+k2/x,
即:4=k1+k2(1)
5=2k1+k2/2(2)
10=4k1+k2
(2)-(1)得:6=3k1,∴k1=2,
k2=2,
1.y=2x+2/x.
2.当x=-2时:y=2×(-2)+2/(-2)=-5.
由y=y1+y2,其中y1=k1x,y2=k2/x
代入:y=k1x+k2/x,
即:4=k1+k2(1)
5=2k1+k2/2(2)
10=4k1+k2
(2)-(1)得:6=3k1,∴k1=2,
k2=2,
1.y=2x+2/x.
2.当x=-2时:y=2×(-2)+2/(-2)=-5.