Media aritmetica a cinci numere este 336.Aflati numerele stiind ca primele trei sunt direct proportionale cu numerele 2, 7 si 12 si al treilea, al patrulea si al cincilea sunt invers proportionale cu numerele 3, 4 si 10
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2014-02-23T19:19:14+02:00
A+b+c+d+e+f=336
a/2=b/7=c/12=d/1/3=e/1/4=f/1/10=k
a=2k
b=7k
c=12k
d=1/3k
e=1/4k
f=1/10k
2k+7k+12k+1/3k+1/4k+1/10k=336
21k+40+30+12k/120=336
21k+82k/120=336
1260+41k/60=336
1301k/60=336
k=60*336/1301
k=20160/1301
a=40320/1301
b=141120/1301
c=241920/1301
d=6720/1301
e=5040/1301
f=2016/1301
4 3 4