Question

determinati media x si y daca :
(1) x+y=18 si x supra y = 0,6
(2) y-x=14 si x supra y = 1 supra 5

Answer 1

1)
x+y=18
x/y=0,6
x=0,6y
0,6y+y=18
1,6y=18
y=18:1,6
y=11,25
x+11,25=18
x=18-11,25
x=6,75
Ma=(x+y):2=(6,75+11,25):2=18:2=9

(2) y-x=14
 x/ y =1/5
y=5x
5x-x=14
4x=14
x=14:4
x=3,5
y-3,5=14
y=14+3,5
y=17,5
ma=(x+y):2=(3,5+17,5):2=21:2=10,5