Răspuns :
x+x+1+x+2=147 => 3x=144 => x=48
t=4f
4f+6+f+6=52 => 5f=40 => f=8 => t=32
x+y=123
5x+y/3=125 => 15x+y=375
Fac sistem si multiplic prima relatie cu -1 , => 4x=252 => 63
63+y=123 => y=60
t=4f
4f+6+f+6=52 => 5f=40 => f=8 => t=32
x+y=123
5x+y/3=125 => 15x+y=375
Fac sistem si multiplic prima relatie cu -1 , => 4x=252 => 63
63+y=123 => y=60
1)a+a+1+a+2=147
3a+3=147
3a=147-3
3a=144
a=48
a+1=48+1=49
a+2=48+2=50
2)x-varsta fiului
4x-varsta tatalui
x+6+4x+6=52
5x+12=52
5x=52-12
5x=40
x=8
8*4=32 ani are tatal
3)a+b=123
a=123-b
5a+b/3= 123+2
5(123-b) + b/3 =125
615 -5b +b =125
-4b = 125 -615
-4b= -490
4b=490
b=122,5
a=123-122,5
a=0,5
3a+3=147
3a=147-3
3a=144
a=48
a+1=48+1=49
a+2=48+2=50
2)x-varsta fiului
4x-varsta tatalui
x+6+4x+6=52
5x+12=52
5x=52-12
5x=40
x=8
8*4=32 ani are tatal
3)a+b=123
a=123-b
5a+b/3= 123+2
5(123-b) + b/3 =125
615 -5b +b =125
-4b = 125 -615
-4b= -490
4b=490
b=122,5
a=123-122,5
a=0,5