3 x 4 4 x 6 9 x 2 18 July 8, 2019 16 32 64 128 Tính nhanh 3 x 4 4 x 6 9 x 2 18 3 x 3 = 9 3 3 4 6 x 13 18 y 3 4 x 9 3) 18 9x - 13 4 =10 1x+13 4) 4 6(x - 3) =4 2+x 3) - x + 4 - x = 9 4) 5 - x - 2 - x = 18
