Question

[12+(57,3-x):0,1]:10 la puterea 2=3

Answer 1

[12+(57,3-x):0,1]:10²=3
[12+(57,3-x):0,1]=3x100
12+(57,3-x):0,1=300
(57,3-x):0,1=300-12
(57,3-x):0,1=288
(57,3-x)=288x0,1
57,3-x=28,8
x=57,3-28,8
x=28,5