6 5 8 x 9 1 2 July 8, 2019 16 32 64 128 6 5 8 x 9 1 2 notebook 9 8 7 6 5 x 4 3 2 1 Cambridge notebook 6 5 8 x 9 1 2 7x 8 5 x 9 )= 20x 1 5 6 3 x 6 )=( 2x 1 5 8 9
