Bā 2. Cho |vec(a)|=|vec(b)|=1,(vec(a), vec(b))=45^circ . Túh a, vec(a) cdot vec(b) b,(vec(a)-3 vec(b))(vec(a)+2 vec(b)) c,|vec(a)+vec(b)| d,|vec(a)-sqrt(2) vec(b)|

Name: bā 2. cho |vec(a)|=|vec(b)|=1,(vec(a), vec(b))=45^circ . túh a, vec(a) cdot vec(b) b,(vec(a)-3 vec(b))(vec(a)+2 vec(b))
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