证明:(1)a1能由a2,a3,......a(m-1)线性表示
(2)a1不能由a2,a3,......a(m-1)线性表示
ï¼1ï¼æ¯æ£ç¡®çï¼ï¼2ï¼æ¯é误çã
è¯æï¼ç±å·²ç¥ï¼åå¨ä¸å ¨ä¸º0çå®æ°ç»k1ï¼k2ï¼......ï¼k(m-1)使
k1a1+k2a2+.....+k(m-1)a(m-1)=0
åå¦k1=0ï¼å k2a2+k3a3+....+k(m-1)a(m-1)=0
è a2ï¼a3ï¼ãããï¼a(m-1)线æ§æ å ³ï¼æ以ç±ä¸å¼å¯å¾k2=k3=....=k(m-1)=0
ä¹å°±æ¯è¯´ï¼a1ï¼a2ï¼a3ãããï¼a(m-1)线æ§æ å ³ï¼è¿ä¸å·²ç¥çç¾
æ k1â 0ï¼
æ以 a1=(-k2/k1)a2+(-k3/k1)a3+.....+(-k(m-1)/k1)a(m-1)
å³ a1è½ç± a2ï¼a3ï¼ãããï¼a(m-1)线æ§è¡¨ç¤ºã追é®
è¯æï¼ç±å·²ç¥ï¼åå¨ä¸å ¨ä¸º0çå®æ°ç»k1ï¼k2ï¼......ï¼k(m-1)使
k1a1+k2a2+.....+k(m-1)a(m-1)=0
åå¦k1=0ï¼å k2a2+k3a3+....+k(m-1)a(m-1)=0
è a2ï¼a3ï¼ãããï¼a(m-1)线æ§æ å ³ï¼æ以ç±ä¸å¼å¯å¾k2=k3=....=k(m-1)=0
ä¹å°±æ¯è¯´ï¼a1ï¼a2ï¼a3ãããï¼a(m-1)线æ§æ å ³ï¼è¿ä¸å·²ç¥çç¾
æ k1â 0ï¼
æ以 a1=(-k2/k1)a2+(-k3/k1)a3+.....+(-k(m-1)/k1)a(m-1)
å³ a1è½ç± a2ï¼a3ï¼ãããï¼a(m-1)线æ§è¡¨ç¤ºã追é®
ä¸å¥½ææï¼ï¼2ï¼ä¸a1æ¯amæ¥çï¼æéäºï¼è¯·åç»åºè¯æï¼è°¢è°¢
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