Question

Aflati lungimea laturilor unui patrulater daca ele sunt direct proportionale cu numerele 2,4,5,7 si perimetrul lui este 108cm

Answer 1

{a, b, c, d} dp{2,4,5,7}
a+b+c+d = 108
a/2=b/4= c/5=d/7=k
a=2k
b=4 k
c= 5k
d=7k
2k+4k+5k+7k =108
18 k=108
k= 108;18
k =6
a=2×6=12
b=4×6=24
c=5×6=30
d=7×6 =42

Answer 2

{a, b, c, d} dp{2,4,5,7} si  a+b+c+d = 108 
a/2=b/4= c/5=d/7=k 
a/2=k   ⇒  a=2k 
b/4=k    ⇒  b=4 k
c/5=k     ⇒  c= 5k
d/7=k   ⇒   d=7k 
2k+4k+5k+7k =108 
18k=108 
k= 108/18 
k =6
a=2×6=12 
b=4×6=24 
c=5×6=30 
d=7×6 =42

Proba: 12+24+30+42=108
108=108