Question

1,6 (2х- 0,42)=2 4/5×7/20 Помогите пожалуйста!

Answer 1

1.6 (2x - 0.42) =  2  4/5    *  7/20
1.6 * 2x   + 1.6  * (-0.42) =  2.8   *  0.35
3.2x    - 0.672  =  0.98
3.2x = 0.980 +0.672
3.2x= 1.652
x= 1.652 : 3.2 = 1652/3200 = 413/800
x = 0.51625
===============================
1.6  * ( 2   *  0.51625   -  0.42)  =  2   4/5   *  7/20
1.6  * ( 1.0325  - 0.4200 ) =  14/5    *  7/20
1.6 * 0.6125 = 98/100
0.98  = 0.98