- 100 - 99 - 98 - ........ - 2 - 1 - 0 + 1 +2 + ... + 97 + 98 + 99 tanpa di hitung persatu pakai jalan

Matematika
Pola Bilangan VII SMP

Pembahasan :
Un = 99
a + (n - 1)b = 99
-100 + (n - 1)1 = 99
-100 + n - 1 = 99
n - 101 = 99
n = 200

-100 - 99 - ... + 99
= S200
= 200/2(-100 + 99)
= 100(-1)
= -100

Bab Pola Bilangan
Matematika SMP Kelas VII

-100 - 99 - 98 + ..... + 98 + 99 = ?
-99 + 99 = 0
-98 + 98 = 0
.
.
tersisa = -100

maka, -100 - 99 - 98 + .....+ 98 + 99 = - 100