1. 363636/848484 = 36/84
30545424 = 30545424
2. 2/5 = 0,4
3/4= 0,75
7/25= 0,28
103/20= 5,15
3. 0,4= 4/10
0,75= 75/100
5,15= 515/100
7,48= 748/100
4. a/b = 5/9
a)
a/b=5/9
=> a=5b / 9
b-a=36 => b-5b/9=36
9b-5b=324 => 4b=324. b=81
a=5b/9 = 5•81/9 = 45
b) a+b=84
a=5b/9 +b = 84
5b+9b=756
14b=756
b=54
a=5b/9 = 5•54/9= 30
c) a•b=45
b• 5b/9 = 45
5b^2 = 405
b^2=81 => b=9
a=5b/9= 5•9/9= 5
