Răspuns :
a-b=12
a:b=2 rest 5
a=2b+5 (teorema impartirii cu rest)
2b+5-b=12
b=7
a=19
sau metoda grafica
a |------|------|-5-| 7×2+5=19
b |------| 7
12-5=7
2 segmente-1 segment= 1 segment
7=1 segment
Răspuns:
a:b=2 rest 5
a-b=12
a|_____|
b|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|_____|
acolada la b la 10 segmente -5
10p=5.
1p=10:5
1p=2(a)
b=2x11
b=22