Răspuns :
Răspuns:
a |------|
b |------|....+5 } 80
c |------|....+12
80-(5+12)=80-17=63
63÷3=21=>a=21
21+5=26=>b=26
26+7=33=>c=33
Proba:21+26+33=80
Răspuns:
Metoda grafica
a /-----------/
5
b /----------/--/ } 80
5 7
c /----------/--/---/
3 parti=80-(5+5+7)
3 parti=80-17
3 parti=63
1 parte=63:3
1 parte=21
a=21
b=21+5
b=26
c=21+5+7
c=26+7
c=33
Metoda algebrica
a+b+c=80
b=a+5
c=b+7
Inlocuim:
a+a+5+b+7=80
a+a+5+a+5+7=80
3a+5+5+7=80
3a+17=80
3a=80-17
3a=63
a=63:3
a=21
b=a+5
b=21+5
b=26
c=b+7
c=26+7
c=33
Verificare:21+26+33=80
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