若向量a b c都为非零向量,且a*c=b*c,有下列六个命题1.a=b 2.a与c成的角与b与c所成的角相等 3.a的模=b的模 4.当a的模=b的模时,a.c所成的角与b.c所成的角相等 5.a.b在c方向上的投影相等 6.当a.c所成的角
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![若向量a b c都为非零向量,且a*c=b*c,有下列六个命题1.a=b 2.a与c成的角与b与c所成的角相等 3.a的模=b的模 4.当a的模=b的模时,a.c所成的角与b.c所成的角相等 5.a.b在c方向上的投影相等 6.当a.c所成的角](/uploads/image/z/5543156-20-6.jpg?t=%E8%8B%A5%E5%90%91%E9%87%8Fa+b+c%E9%83%BD%E4%B8%BA%E9%9D%9E%E9%9B%B6%E5%90%91%E9%87%8F%2C%E4%B8%94a%2Ac%3Db%2Ac%2C%E6%9C%89%E4%B8%8B%E5%88%97%E5%85%AD%E4%B8%AA%E5%91%BD%E9%A2%981.a%3Db+2.a%E4%B8%8Ec%E6%88%90%E7%9A%84%E8%A7%92%E4%B8%8Eb%E4%B8%8Ec%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E7%9B%B8%E7%AD%89+3.a%E7%9A%84%E6%A8%A1%3Db%E7%9A%84%E6%A8%A1+4.%E5%BD%93a%E7%9A%84%E6%A8%A1%3Db%E7%9A%84%E6%A8%A1%E6%97%B6%2Ca.c%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E4%B8%8Eb.c%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E7%9B%B8%E7%AD%89+5.a.b%E5%9C%A8c%E6%96%B9%E5%90%91%E4%B8%8A%E7%9A%84%E6%8A%95%E5%BD%B1%E7%9B%B8%E7%AD%89+6.%E5%BD%93a.c%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92)
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