... 3 2121 1ab(;;),(;;) =-= - rr Baứi 8. Tỡm vect ur, bit rng: a) 213132324 5 1120 abcauubuc(;;),(;;),(;;).,.,.ỡ =-= - =- ớ =-= -= ợrrrrrrrrr b) 23 1123 2116abcuaubuc(;;),(;;),(;;),,.ỡ =-= - =- ớ^^ =- ợrrrrrrrrr ... ()()()1022300341622abcu;;,;;,;;(;;)ì= =-= - í= îrrrr e) ()()()23 11 25 226 312 abcu;;,;;,;;(;;)ì =-= - =- í=îrrrr f) ()()()2111323224 35 abcu;;,;;,;;(;;)ì =-= -= í =- îrrrr Baøi 15. Chứng ... ()()() 121 21022ambmcm;;,;;,;;==+ =- rrr b) 2 1121 122 212 ammbmmcmm(;;);(;;),(;;)= +-= ++=+rrr c) ()()() 121 2122 ammmbmmmc;;,;;,;;= +-= -+ =rrr d) ()()()13 2121 022abmmmcm;;,;;,;; =-= +...