3 2 x 4 9 1 6 July 8, 2019 16 32 64 128 1 2 3 4 x 6 7 8 9 Ipad case 6 3 4 x 9 1 2 3 4 x 6 )- 1 4x 2 4 x 9 3 x 6 x 2 x 9 5 1 4 2 x 3 )/ 4 1 2 6x 9 3 3 x 3 = 9 9 3/4 + 3 1/6 3 4-9×=1 6 9 4/21 x 3/6
