若lal=3,lbl=1 ,lcl=5 la+cl=-(a+c),

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若lal=3,lbl=1 ,lcl=5 la+cl=-(a+c),
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若lal=3,lbl=1 ,lcl=5 la+cl=-(a+c),
若lal=3,lbl=1 ,lcl=5 la+cl=-(a+c),

若lal=3,lbl=1 ,lcl=5 la+cl=-(a+c),
la+cl=-(a+c) a+c<0 lal=3 ,lcl=5 a=3,c=-5 lbl=1 ,b=±1 a-b+c=3-1+5=7 a-b+c=3-(-1)+5=9

la+cl=-(a+c) a<0,c<0 lal=3 ,lcl=5 a=-3,c=-5 lbl=1 b=1或b=-1 a-b+c=-3-1-5=-9 或a-b+c=-3+1-5=-7