Răspuns :
(a+b): 2= 15
a/b= 1/4 =) 4a=b
(a+4a):2= 15
5a= 30
a= 6
Dacă 4a=b =) 6*4=b =) b= 24
a/b= 1/4 =) 4a=b
(a+4a):2= 15
5a= 30
a= 6
Dacă 4a=b =) 6*4=b =) b= 24
(a+b)/2=15
a/b=1/4 =>b=4a
(a+4a)/2=15
5a/2=15
5a=15*2
5a=30
a=30:5
a=6
b=4*a=4*6=24
a/b=1/4 =>b=4a
(a+4a)/2=15
5a/2=15
5a=15*2
5a=30
a=30:5
a=6
b=4*a=4*6=24