... s, x5= t ; s, t ∈ RNghiˆe.mtˆo’ng qua´t cu’ahˆe.la`: X =(s,32t −s,−32t, 0,t)Ta co´ : (r(A)=3,n=5⇒ k =5−3=2)Cho.n s =1,t=0⇒ x1=( 1, − 1, 0, 0, 0)s =0,t =1⇒ x2=( 0, 32 , −32 , ... 1, 0, 0)Cho x2=0,x3= 1 ta co´ nghiˆe.mcu’ahˆe.d¯ a˜cho la`: ( 0, 0, 1, 2)Vˆa.yhˆe.nghiˆe.mco.ba’ncu’ahˆe.d¯ a˜cho la`: {(− 2, 1, 0, 0) ; ( 0, 0, 1, 2)}*. Vı´ du.2: ... phˆa`ntu.’cu’a ma trˆa.n A d¯ ˆe`u nhˆa.n gia´ tri.thu..c, co´ nghı˜ala`aij∈ R, thı` ma trˆa.n A d¯ u.o..cgo.i la` ma trˆa.nthu..c.*. Vı´ du.:A = ( 15 ) la` ma trˆa.ncˆa´p1×1.B...