Tìm x a. x : 3 + 23 = 34 b. 24 – 4 × x = 8

* Hướng dẫn giải

a. x : 3 + 23 = 34

             x : 3 = 34 – 23

             x : 3 = 11

                  x = 11 × 3

                  x = 33

b. 24 – 4 × x = 8

            4 × x = 24 – 8

            4 × x = 16

                  x = 16 : 4

                  x = 4