4 9 x 13 3 4 3 x 10 9 July 8, 2019 16 32 64 128 4 9 x 13 3 4 3 x 10 phần 9 3 x 3 = 9 3) 18 9x - 13 4 =10 1x+13 4) 4 6(x - 3) =4 2+x 3) 18 9x-13 4 10 1x+13
