Question

cone imi rezolva exercitiile 11 12 13 14 si 15 primeste un cont e clash royale arena 10 cu toate legendarele free

Answer 1

11.
a+b=3,72
b=a/3+0,6=a/3+6/10=(10a+18)/30
a+(10a+18)/30=3,72⇒30a+10a+18=3,72×30
40a=111,6-18⇒40a=93,6⇒a=2,34
daca a+b=3,72⇒b=3,72-a=3,72-2,34⇒b=1,38
deci b = 1,38 si a = 2,34
12
a+b+c=101,2
b=a/2+0,4
c=3a
 a+(a/2+0,4)+3a=101,2
a+a/2+4/10+3a=101,2

4a×10+5a+4=101,2×10
40a+5a=1012-4
45a=1008
a=1008:45
a=22,4
b=a/2+0,4 =11,2+0,4=11,6
b=11,6
c=3a=3×22,4=67,2
c=67,2
verificare
a+b+c=101.2
67,2+22,4+11,6=101,2
101,2=101,2

13
5m costa 181 lei
1m costa x lei
1m=181:5=36,2 lei
daca 1 m costa 36,2 lei
atunci 3,45 costa x lei

x=36,2×3,45=124,89 lei
14.
3kg p.......................4kg c ..............36,50/×2 (inmultim cu 2)
6kg p ......................7kg c ...............67,25
devine
6kg p ....................8kg c ...................73,00
6kg p ....................7kg c ...................67,25
acum le scadem
(8-7=1) deci 1kg c = 73,00-67,25=5,75

4kg c = 5,75× 4 = 23,00lei
36,50 - 23,00=13,50lei
3kg p = 13,50 lei
1kg p =13,50:3=4,50 lei
1 kg de caise =5,75 lei
1 kg piersici =4,50 lei

15.
2(l+L)=54,36 m
l+L=27,18 m  si L=8l
l+8l=27,18 m
9l=27,18 m
l=3,02 m si L=8×3,02=24,16 m
A=l×L=3,02×24,16=72,9632 m²