Răspuns:
Explicație pas cu pas:
28)
K= constanta de proportionalitate
a,b,c= cele 3 numere
a+b+c= 16*3=48
-
(a,b,c ) dp ( 4,5,7 )
-
a/4=b/5=c/7=k
a=4K
b=5K
c=7K
-
4K+5K+7K=48
16K=48
K=48:16
K= 3
-
a= 4K=4*3=12
b=5K=5*3=15
c=7K=7*3=21
-
29)
x,y,z = cele 3 nr
(x,y,z) dp (2,5,7 )
X/2=Y/5=Z/7= K
x=2k
y=5k
z=7k
x*y*560
2k*5k*7k=560
70k=560
k= 560:70
K³= 8
k³= 2³
k=2
-
x=2k=2*2=4
y=5k=5*2=10
z=7k=7*2=14
