Dasar - Dasar Matematika (64)

Dasar – Dasar Matematika (64)

Oleh : Suryadi

Director of Education Apenso Indonesia

Penjumlahan Bilangan Bulat
Jika a dan c bilangan-bilangan asli maka :

• ( - a ) + ( - c ) = - ( a + c )

Contoh :
( - 3 ) + ( - 4 ) = - ( 3 + 4 ) = - 7

• a + ( - c ) = a - c , dimana a > c

Contoh :
5 + ( - 4 ) = 5 – 4 = 1

• (- a ) + c = - ( a – c ), dimana a > c

Contoh :
- 5 + 4 = - ( 5 – 4 ) = - 1

• a + ( - c ) = - (c – a ), dimana a < c

Contoh :
4 + ( - 5 ) = - ( 5 – 4 ) = - 1

• ( - a ) + c = c – a , dimana a < c

Contoh :
( - 4 ) + 5 = 5 – 4 = 1