Răspuns :
1. a I____I
b I____I____I..5..I
c I____I..1..I in total 126
egalam partile 126-1-5=120
nr partilor egale 1+2+1=4
primul copil are 120:4=30 lei
al doilea copil are 30x2+5=65 lei
al treilea copil are 30+1=31 lei
verificare 30+65+31=126 lei
3. A I______I
R I______I.....25....I total 187 mingi
egalam partile 187-25=162
nr partilor egale 1+1=2
cate mingi are Alin ? 162:2=81
cate mingi are Roxana? 81+25=106
verificare 81+106=187
b I____I____I..5..I
c I____I..1..I in total 126
egalam partile 126-1-5=120
nr partilor egale 1+2+1=4
primul copil are 120:4=30 lei
al doilea copil are 30x2+5=65 lei
al treilea copil are 30+1=31 lei
verificare 30+65+31=126 lei
3. A I______I
R I______I.....25....I total 187 mingi
egalam partile 187-25=162
nr partilor egale 1+1=2
cate mingi are Alin ? 162:2=81
cate mingi are Roxana? 81+25=106
verificare 81+106=187
1. a+b+c= 126
b=2a+5 ⇒ b= 2·30+5=65
c= a+1 ⇒c=30+1=31
a+2a+5+a+1=126
4a+6=126
4a=120
a=30
2.inzecitul lui 9 = 90
bile albe= 1/3 x 90 = 90/3=30
bile negre+ bile galbene= 30·2=60
albe+negre+ galbene=200
Nu prea inteleg problema asta.
3. Prima zi ⇒ 380 m
A doua zi ⇒ 1/4 · 380= 380/4=95
A treia zi ⇒ 875- ( 380+95)= 875- 475= 400
4. a+r = 187
a-r= 25
⇒ 2a= 187+25
2a= 212
a=212: 2
a=106
106+r = 187
r=187-106
r= 81
Proba: a-r = 25
106- 81=25
b=2a+5 ⇒ b= 2·30+5=65
c= a+1 ⇒c=30+1=31
a+2a+5+a+1=126
4a+6=126
4a=120
a=30
2.inzecitul lui 9 = 90
bile albe= 1/3 x 90 = 90/3=30
bile negre+ bile galbene= 30·2=60
albe+negre+ galbene=200
Nu prea inteleg problema asta.
3. Prima zi ⇒ 380 m
A doua zi ⇒ 1/4 · 380= 380/4=95
A treia zi ⇒ 875- ( 380+95)= 875- 475= 400
4. a+r = 187
a-r= 25
⇒ 2a= 187+25
2a= 212
a=212: 2
a=106
106+r = 187
r=187-106
r= 81
Proba: a-r = 25
106- 81=25