Răspuns :
A + B = 15
2
A = 1
B 4
A + B = 30
B = 4A
A + 4A = 30
5A = 30
A = 30 : 5
A = 6
B = 4 * 6
B = 24
2
A = 1
B 4
A + B = 30
B = 4A
A + 4A = 30
5A = 30
A = 30 : 5
A = 6
B = 4 * 6
B = 24
a/b=1/4⇒b=4a
(a+b):2=15
a+b=15x2
a+b=30
a+4a=30
5a=30
a=30:5
a=6 b=4a=4x6=24 b=24
(a+b):2=15
a+b=15x2
a+b=30
a+4a=30
5a=30
a=30:5
a=6 b=4a=4x6=24 b=24