Question

Suma a doua numere consecutive este 999.
Altair numerele.

Answer 1

a + b = 999 - numere consecutive

a + a + 1 = 999

a + a = 999 - 1

a + a = 998

2a = 998

a = 998 : 2

a = 499

499 + b = 999

b = 999 - 499

b = 500

Verificare: 499 + 500 = 999

Answer 2

Metoda figurativa

a |-----|

b |-----|..+1

(faci acolada si scrii 999)

2 segmente +1=999

2 segmente =999-1

2 segmente =998

1 segment = 998:2

1 segment = 499

a=499

b=1 segment +1=499+1=500

Raspuns numerele sunt 499 si 500