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y=a/|a| + b/|b| + ab/|ab|
case 1: a>0 ,b>0
y=a/|a| + b/|b| + ab/|ab|
=1+1+1
=3
case 2: a>0 ,b<0
y=a/|a| + b/|b| + ab/|ab|
=1-1-1
=-1
case 3: a<0 ,b>0
y=a/|a| + b/|b| + ab/|ab|
=-1+1-1
=-1
case 4: a<0 ,b<0
y=a/|a| + b/|b| + ab/|ab|
=-1-1+1
=-1
集合 ={3, -1}
case 1: a>0 ,b>0
y=a/|a| + b/|b| + ab/|ab|
=1+1+1
=3
case 2: a>0 ,b<0
y=a/|a| + b/|b| + ab/|ab|
=1-1-1
=-1
case 3: a<0 ,b>0
y=a/|a| + b/|b| + ab/|ab|
=-1+1-1
=-1
case 4: a<0 ,b<0
y=a/|a| + b/|b| + ab/|ab|
=-1-1+1
=-1
集合 ={3, -1}
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