Răspuns :
a-b=20
a=b:3 =>b=3·a
a ,b = ?
REZOLVARE
a ___
b ___ ___ ___
20:4=5 a
5·3=15 b
a=b:3 =>b=3·a
a ,b = ?
REZOLVARE
a ___
b ___ ___ ___
20:4=5 a
5·3=15 b
a-b=20 |...|b
a=3xb |...|...|a
3-1=2(partile egale)
20:2=10(b)
10x3=30(a)
a=3xb |...|...|a
3-1=2(partile egale)
20:2=10(b)
10x3=30(a)