... ()()() 121 21022ambmcm;;,;;,;;==+ =- rrr b) 2 1121 122 212 ammbmmcmm(;;);(;;),(;;)= +-= ++=+rrr c) ()()() 121 2122 ammmbmmmc;;,;;,;;= +-= -+ =rrr d) ()()()13 2121 022abmmmcm;;,;;,;; =-= + =- rrr Baøi ... 3 2121 1ab(;;),(;;) =-= - rr Baứi 8. Tỡm vect ur, bit rng: a) 2131323245 1120 abcauubuc(;;),(;;),(;;).,.,.ỡ =-= - =- ớ =-= -= ợrrrrrrrrr b) 23 1123 2116abcuaubuc(;;),(;;),(;;),,.ỡ =-= - =- ớ^^ =- ợrrrrrrrrr ... 548230177abc(;;),(;;),(;;) =-= - =- rrr g) 24 3122 321abc(;;),(;;),(;;) =-= - =- rrr h) 243132321abc(;;),(;;),(;;) =-= =- rrr Baøi 13. Tìm m để 3 vectơ abc,,rrr đồng phẳng: a) ()()() 121 21022ambmcm;;,;;,;;==+ =- rrr...