Question

ma puteti ajuta la 3,4,5 dau coroana ....va rog mult

Answer 1

3.
50*4,5=225LEI
20*2,7=54LEI
30*1,5=45LEI
Pm= (225+54+45)/100 =324/100=3,24lei/kg
4.
(a+b+c):3= 1/3
(a+b)/2 = (b+c)/2
a+b=b+c
a=c
a+b+c=1
2a+0,7=1
2a=0,3
a=0,3/2
a= 0,15
a=c=15/100

5.
a+b=120 de unde rezulta ca a=120-b
a/2-b/3=35
(3a-2b)/6=35
3a-2b=35*6
3a-2b= 210
(120-b)*3 -2b=210
360-3b-2b=210
360-5b=210
360-210=5b
b=150:5
b=30
a=120-30
a=90