Question

Cine ma ajuta la aceste exercitii: 1)a+b+c=27, a-de 3 ori mai mare decat b, c-cu 7 mai mare decat b.a=?,b=?,c=? 2)a+b+c=98.b-dublul primului,c-cu 18 mai mare decat primul.a=?,b=?,c=? 3)a+b+c=108.b-cu19 mai mare decat a,c- cu 20 mai mare decat a. a=?,b=?,c=? va rog ajutatima.

Answer 1

A+b+c=27 A=3xb C=b+7 A,b,c=? B |-----|} A|--------|----------|---------|} C|--------| -------+7 } 27-7=20 20:5=4 4x3=12 4+7=11 V: 4+12+11=27

Answer 2

a+b+c=27
a=3b
c=b+7
3b+b+b+7=27
5b=27-7
5b=20
b=20:5=4
a=3b=3x4=12
c=b+7=4+7=11
12+4+11=27(verificare

a+b+c=98
b=2a
c=a+18
a+2a+a+18=98
4a=98-18
4a=80
a=80:4=20
b=2a=2x20=40
c=a+18=20+18=38
20+40+38=98(verificare)

a+b+c=108
b=a+19
c=a+20
a+a+19+a+20=108
3a=108-39
3a=69
a=69:3=23
b=a+19=23+19=42
c=a+20=23+20=43
23+42+43=108