若abc大于0求绝对值a/a+绝对值b/b+绝对值c/c的值
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abc>0
|a|/a +b|/b+|c|/c
case 1: c>0 => ab>0
|a|/a +b|/b+|c|/c
=-1-1 +1 or 1+1+1
=-1 or 3
case 2: c <0 => ab<0
|a|/a +b|/b+|c|/c
=-1+1 -1 or 1-1-1
=1 or -1
Similarly
b>0 => |a|/a +b|/b+|c|/c =-1 or 3
b<0 => |a|/a +b|/b+|c|/c =1 or -1
a>0 => |a|/a +b|/b+|c|/c =-1 or 3
a<0 => |a|/a +b|/b+|c|/c =1 or -1
ie
|a|/a +b|/b+|c|/c =-1 or 1 or 3
|a|/a +b|/b+|c|/c
case 1: c>0 => ab>0
|a|/a +b|/b+|c|/c
=-1-1 +1 or 1+1+1
=-1 or 3
case 2: c <0 => ab<0
|a|/a +b|/b+|c|/c
=-1+1 -1 or 1-1-1
=1 or -1
Similarly
b>0 => |a|/a +b|/b+|c|/c =-1 or 3
b<0 => |a|/a +b|/b+|c|/c =1 or -1
a>0 => |a|/a +b|/b+|c|/c =-1 or 3
a<0 => |a|/a +b|/b+|c|/c =1 or -1
ie
|a|/a +b|/b+|c|/c =-1 or 1 or 3
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