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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