The matrices and vectors listed in Eq. (3) are used in several of the exercises that follow. 31 -D-D 4 7 B= = 743 26 A = C c=| 2140 6135 24 20 121 601 D = 21 4 36 E = *-[23] *-[¦¦]; -3 -[A] +[B] = 3 Exercises 1-25 refer to the matrices and vectors in Eq. (3). In Exercises 1-6, perform the multiplications to verify the given equality or nonequality. 1. (DE)F = D(EF) 2. (FE)D = F(ED) 3. DE ED 4. EF # FE 5. Fu = Fv 6. 3 Fu = 7Fv

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