Question

aflati x din proportia x*1,(6) supra 0,(5)=0,4(6) supra 3,75

Answer 1

daca ex.este:(x·1,(6))/0,(5)=0,4(6)/3,75
atunci se rezolva astfel
1,(6)=(16-1)/9=15/9 simplificam cu 3=5/3
0,(5)=5/9
0,4(6)=(46-4)/90=42/90 simplificam cu 6=7/15
3,75=375/100 simplificam cu 25=15/4
5x/3:5/9=7/15:15/4
5x/3·9/5=7/15·4/15
45x/15=28/225
45x·225=15·28
x=15·28/45·225 simplificam
x=28/375
x=0,074