若ab≠0,求|a|/a+|b|/b的值
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case 1: a<0 and b<0
|a|/a +|b|/b
=-a/a -b/b
=-1-1
=-2
case 2: a<0 and b>0
|a|/a +|b|/b
=-a/a +b/b
=-1+1
=0
case 3: a>0 and b<0
|a|/a +|b|/b
=a/a -b/b
=1-1
=0
case 4: a>0 and b>0
|a|/a +|b|/b
=a/a +b/b
=1+1
=2
|a|/a +|b|/b
=-a/a -b/b
=-1-1
=-2
case 2: a<0 and b>0
|a|/a +|b|/b
=-a/a +b/b
=-1+1
=0
case 3: a>0 and b<0
|a|/a +|b|/b
=a/a -b/b
=1-1
=0
case 4: a>0 and b>0
|a|/a +|b|/b
=a/a +b/b
=1+1
=2
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