k1(a-b)+k2(b-kc)+k3(c-a)=0
(k1-k3)a+ (-k1+k2)b + (-k2k+k3)c =0
a,b,c线性无关
k1-k3=0 (1)
-k1+k2=0 (2)
-k2k + k3=0 (3)
from(1)
k1 =k3
from (2)
k2= k1 = k3
from(3)
k3 = k3k
k3(1-k) = 0
a-b,b-kc,c-a线性无关的充分必要条件是:
k 不等于 1
k1(a-b)+k2(b-kc)+k3(c-a)=0
(k1-k3)a+ (-k1+k2)b + (-k2k+k3)c =0
a,b,c线性无关
k1-k3=0 (1)
-k1+k2=0 (2)
-k2k + k3=0 (3)
from(1)
k1 =k3
from (2)
k2= k1 = k3
from(3)
k3 = k3k
k3(1-k) = 0
a-b,b-kc,c-a线性无关的充分必要条件是:
k 不等于 1