解由当x=2时,y1+y2=-1
得2k1+2k2=-1
即k1+k2=-1/2.①
当x=3时,y1-y2=12
得3k1-3k2=12
即k1-k2=4.②
由(1)与(2)联立
解得k1=7/4,k2=-9/4
故y1=7x/4,
y2=-9x/4
2当x=24时,
y1=7*24/4=42
y2=-9*24/4=-54
故-y1*y2-254
=-42*(-54)-254
=2268-254
=2014
解由当x=2时,y1+y2=-1
得2k1+2k2=-1
即k1+k2=-1/2.①
当x=3时,y1-y2=12
得3k1-3k2=12
即k1-k2=4.②
由(1)与(2)联立
解得k1=7/4,k2=-9/4
故y1=7x/4,
y2=-9x/4
2当x=24时,
y1=7*24/4=42
y2=-9*24/4=-54
故-y1*y2-254
=-42*(-54)-254
=2268-254
=2014