Question

Dau coroana pentru ambele probleme. Mulțumesc!

Answer 1

14)405+345+126=876 ramasi bani in total
975-876=99 lei au cheltuit cei trei copii
99:3=33 lei au costat jucariile de copil
405+33=438 lei 1 copil
345+33=378 lei 2 copil
126+33=159 lei 3 copil
Verificare
438+378+159=975 lei

15)a-baloane verzi
B-baloane rosii
C-galbene
A+b+c=900
A=3b
A=c-25
C=25+a
C=25+3b
3b+b+25+3b=900
7b=900-25
B=875:7
B=125 baloane rosii
A=3x125
A=375 baloane verzi
C=25+375
C=400 baloane galbene
Verificare

375+125+400=900
500+400=900
900=900

Answer 2

14
x-cat costa jucaria
Primul -a
Al doilea -b
Al treilea -c
a+b+c= 975
a-x= 405
b-x= 345
c-x= 126
405+x+345+x+126+x=975
876+3x=975
3x= 975-876
3x=99
x=99:3
x=33
a-33=405=>a= 438
b-33=345=>b= 378
c-33=126= >c= 159

15)
v+r+g=900
r |----|
v|----|----|----|
g|----|----|----| +25
x-numarul de segmente egale
7 x+25=900
7x=900-25
7x=875
x=875:7
x=125
R =125
V= 3×R= 3×125=375
G= v+25=375+25= 400