Page 38 - Praktikum Media Pembelajaran Flip PDF_Arif Kurniawan Siahaan
P. 38

Contoh :



                                     2    −1     3             −1    2     3
         Diketahui matriks A =  −2          1    1 dan B =  4        5    −1 Hitunglah :
                                    −1 −2        1             −2    0     1
         1.       

         2.       

         Penyelesaian :



                       2     −1    3
         1.        =  −2      1    1 = 2 . 1. 1 + (-1) . 1 . (-1) + 3 . (-2) . (-2) – 3 . 1 . (-1) – 2 . 1 . (-2) – (-1) . (-2) . 1

                      −1     −2    1
                                      = 2 + 1 + 12 + 3 + 4 – 2 = 20



                       −1 2       3
         2.        =  4      5   −1 = (-1) . 5 . 1 + 2 . (-1) . (-2) + 3 . 4 . 0 – 3 . 5 . (-2) – (-1) . (-1) . 0 – 2 . 4 . 1
                       −2 0       1
                                       = -5 + 4 + 0 – (-30) – 0 – 8 = 21
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