Răspuns :
[tex]a-b=40 \\ a:b=4 \ rest \ 1 \to \boxed{a=4b+1} \\ \\ 4b+1-b=40 \\ 3b+1=40 \\ 3b=40-1 \\ 3b=39 \\ b=39:3 \\ b=13 \\ \\ a-13=40 \\ a=40+13 \\ a=53[/tex]
a - b = 40
a : b = 4 rest 1
a = 4b + 1
4b + 1 - b = 40
3b = 40 - 1
b = 39 : 3
b = 13
a - 13 = 40
a = 53
a : b = 4 rest 1
a = 4b + 1
4b + 1 - b = 40
3b = 40 - 1
b = 39 : 3
b = 13
a - 13 = 40
a = 53