Konsep Operasi Hitung

Contoh 1:

– a + (-b) = – (a + b)

– 7 + (-10) = – (7 + 10) = – 17

Contoh 2:

– a + b = – (a – b)

– 8 + 7 = – (8 – 7) = – 1

Contoh 3:

– a + b = b – a

– 3 + 2 = 2 – 3 = – 1

Pengurangan

Rumus pengurangan bilangan dalam bilangan bulat yaitu:

a – b = a + (-b)

a – (-b) = a + b

Contoh 1:

a – b = a + (-b)

7 – 1 = 7 + (-1) = 6

Contoh 2:

a – (-b) = a + b

8 – (-2) = 8 + 2 = 10

Perkalian

Jika p dan q bilangan bulat maka: p x q = pq

p x (-q) = – (p x q) = – pq

(-p) x q = – (p x q) = – pq

(-p) x (-q) = p x q = pq

Contoh 1:

p x (-q) = – (p x q) = – pq

3 x (-2) = – (3 x 2) = -6