Question

nr naturale a,b si c direct proportinoanale cu 4, 16 si 20 . Aflati media aritmetică ​

Answer 1

a,b,c d.p. 4,16,20

a/4=b/16=c/20=a+b+c/4+16+20

=a+b+c/40=k

a=4k , b=16k ,c=20k

ma= 4k+16k+20k/3 =40k/3

a+b+c/40 = a+b+c/40/2

a+b+c/40 × 1/2 = a+b+c/80

40k/80 rezulta ca ma=2k