Question

1) (0.1-х):0.106=0.67
2) 0.78 умножить (х+0.2)=3.9

Answer 1

1. ( 0.1 -x) : 0.106 = 0.67
0.1-x = 0.67*0.67
0.1 - x = 0.07102
x = 0.1-0.07102
x = 0.02898

2. 0.78*(x+0.2) = 3.9
x + 0.2 = 3.9 : 0.78
x + 0.2 =  5
x = 5 - 0.2
x = 4.8