Question

Ajutatima:
a) Scrie numarul 300 ca suma a patru numere direct proportionale cu 2,3,4,6.
b) Scrie numarul 130 ca o suma de trei numere invers proportionale cu 2,3,4.

Answer 1

a/2=b/3=c/4=d/6=k
a/2=k a=2k
b/3=k  b=3k
c/4=k  c=4k
d/6=k  d=6k

a+b+c+d=300
2k+3k+4k+6k=300
15k=300
k=300:15
k=20
deci a=2k=2*20=40
b=3k=3*20=60
c=4k=4*20=80
d=6k=6*20=120
40+60+80+120=300