Question

[Pham Trong Bach]

Tìm x:

a)  x .12 , 5 = 1 , 2 + 25 %

b)  0 , 4 x − 1 5 x = 3 4

Answer 1

[Cao Minh Tâm]

a)

x .12 , 5 = 1 , 2 + 25 % x .12 , 5 = 1 , 2 + 0 , 25 x .12 , 5 = 1 , 45 x = 1 , 45 : 12 , 5 x = 0 , 116

b)

0 , 4 x − 1 5 x = 3 4 2 5 − 1 5 x = 3 4 1 5 x = 3 4 x = 15 4