Tìm x 19 20 x 8 5 3 4 July 8, 2019 16 32 64 128 Tìm x x + 4 32 = 8 67 80 / x = 8 32 / x = 4 x / 8 = 8 x * 3 = 21 x + 29 = 80 x - 2 = 40 19 - 15 x - 2 = 26 - 8x
