Question

aflati x y z numerele stiind ca sunt invers proportionale cu 4 5 7 si 1/x+1/y+1/z = 5​

Answer 1

Răspuns:

Explicație pas cu pas:

deci

4x=5y=7z=k

x=k/4

y=k/5

z=k/7

4/k+5/k+7/k=5

16/k=5

5k=16

k=16/5

x=k/4=4/5

y=k/5=16/25

z=k/7=16/35

verificare

5/4+25/16+35/16=20/16+60/16=80/16=5

BINE REZOLVAT