Dasar - Dasar Matematika (65)

Dasar - Dasar Matematika  (65)

Oleh : Suryadi

Director of Education Apenso Indonesia

Hukum Komutatif Penjumlahan Bilangan Bulat

• ( - a ) + ( - c ) = ( - c ) + ( - a )

Contoh :

( - 4 ) + ( - 5 ) = ( - 5 ) + ( - 4 )

- ( 4 + 5 ) = - ( 5 + 4 )

- 9 = - 9

• ( - a ) + c = c + ( - a )

Contoh :

( - 3 ) + 2 = 2 + ( - 3 )

-  (3 – 2 ) = ( 2 – 3 )

-1 = -1

• a + ( - c ) = ( - c ) + a

Contoh :

4 + ( - 3 ) = ( - 3 ) + 4

4 – 3 = - (3 – 4 )

1 = - ( - 1 )

1 = 1