k1b1+k2b2+k3b3=0
k1(4a1-4a2)+k2(a1-a2+a3)+k3(a2-a3)=0
(4k1+k2)a1+(-4k1-k2+k3)a2+(k2-k3)a3=0
=>
4k1+k2 =0 (1)
-4k1-k2+k3=0 (2)
k2-k3=0 (3)
=>k1=k2=k3=0
=>b1,b2,b3线性相关
k1b1+k2b2+k3b3=0
k1(4a1-4a2)+k2(a1-a2+a3)+k3(a2-a3)=0
(4k1+k2)a1+(-4k1-k2+k3)a2+(k2-k3)a3=0
=>
4k1+k2 =0 (1)
-4k1-k2+k3=0 (2)
k2-k3=0 (3)
=>k1=k2=k3=0
=>b1,b2,b3线性相关