∴a、b、c中二負(fù)一正,
又b+c=-a,c+a=-b,a+b=-c,
∴
b+c |
|a| |
c+a |
|b| |
a+b |
|c| |
?a |
|a| |
?b |
|b| |
?c |
|c| |
而當(dāng)a>0時(shí),
?a |
|a| |
?a |
|a| |
∴
?a |
|a| |
?b |
|b| |
?c |
|c| |
∴
b+c |
|a| |
c+a |
|b| |
a+b |
|c| |
故答案為:1.
b+c |
|a| |
c+a |
|b| |
a+b |
|c| |
b+c |
|a| |
c+a |
|b| |
a+b |
|c| |
?a |
|a| |
?b |
|b| |
?c |
|c| |
?a |
|a| |
?a |
|a| |
?a |
|a| |
?b |
|b| |
?c |
|c| |
b+c |
|a| |
c+a |
|b| |
a+b |
|c| |