Răspuns :
A/ Fie a si b-cele 2 nr.
a+b=45
a:b=4 (rest 5)=>a=4b+5
4b+5+b=45
5b=45-5
5b=40:5
b=8=>a=4*8+5=37
B/ Fie a si b-cele 2 nr.
a-b=158
a:b=18 (rest 5)=>a=18b+5
18b+5-b=158
17b=158-5
17b=153
b=153:17
b=9=>a=18*9+5=162+5=167
a+b=45
a:b=4 (rest 5)=>a=4b+5
4b+5+b=45
5b=45-5
5b=40:5
b=8=>a=4*8+5=37
B/ Fie a si b-cele 2 nr.
a-b=158
a:b=18 (rest 5)=>a=18b+5
18b+5-b=158
17b=158-5
17b=153
b=153:17
b=9=>a=18*9+5=162+5=167