Tìm a,b,c

T

thaotran19

a)Từ đề bài ta có:
$a(a+b+c)+b(a+b+c)+c(a+b+c)=-12+18+30$
\Leftrightarrow$ (a+b+c)^2=36$

$TH_1: a+b+c=6$
\Rightarrow $a=-2;b=3;c=5$

$TH_2: a+b+c=-6$
\Rightarrow $a=2;b=-3;c=-5$
 
Last edited by a moderator:
You must log in or register to reply here.
Top Bottom