Tìm x : 36 : x : x + 2015 = 2019
Giải thích
36 : X : X + 2015 = 2019
36 : (X x X) + 2015 = 2019
36 : (X x X) = 2019 – 2015
36 : (X x X) = 4
X x X = 36 : 4
X x X = 9
Ta thấy 3 x 3 = 9
vậy x = 3
36 : X : X + 2015 = 2019
36 : (X x X) + 2015 = 2019
36 : (X x X) = 2019 – 2015
36 : (X x X) = 4
X x X = 36 : 4
X x X = 9
Ta thấy 3 x 3 = 9
vậy x = 3