题目内容
已知
=-1，求(
)+
+
×(
)×
×
的值．
| abc |
| |abc| |
| a |
| |a| |
| |b| |
| b |
| c |
| |c| |
| ac |
| |bc| |
| bc |
| |ac| |
| ab |
| |ab| |
| abc |
| |abc| |
①当a、b、c全是负数，
则原式=
| a |
| |a| |
| |b| |
| b |
| c |
| |c| |
| (abc)2 |
| |abc|2 |
═
| a |
| |a| |
| |b| |
| b |
| c |
| |c| |
=-1-1-1
=-3；
②a、b、c两正一负，
则原式=
| a |
| |a| |
| |b| |
| b |
| c |
| |c| |
| (abc)2 |
| |abc|2 |
=
| a |
| |a| |
| |b| |
| b |
| c |
| |c| |
计算的结果是1+1-1=1．
所以原式的值是1或-3．
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