Question

-100 - 99 - 98 - ... - 2 - 1 - 0 + 1 + 2 + ... + 48 + 49 + 50 = ? pls help

Answer 1

Mapel : Matematika
Kelas : IX SMP
Bab : Barisan dan deret

Pembahasan :
Un = 50
a + (n - 1)b = 50
-100 + n - 1 = 50
n - 101 = 50
n = 151

-100 - 99 - 98 - ... + 50
= S151
= 151/2(-100 + 50)
= 151/2(-50)
= -3775