Răspuns :
A) a + b = 45
a : b =4 rest 5
a = 4 b +5
4b + 5 + b = 45
5b +5 =45
5b = 40
b = 8
a = 4b+5
a=4 · 8 +5
a = 37
B) a-b=158
a: b= 18 rest 5
a = 18b +5
18b+5-b=158
17b=158-5
17b=153
b=9
a=18b+5
a=18 · 9 +5
a=162+5
a=167
a : b =4 rest 5
a = 4 b +5
4b + 5 + b = 45
5b +5 =45
5b = 40
b = 8
a = 4b+5
a=4 · 8 +5
a = 37
B) a-b=158
a: b= 18 rest 5
a = 18b +5
18b+5-b=158
17b=158-5
17b=153
b=9
a=18b+5
a=18 · 9 +5
a=162+5
a=167