8+10+12+14+......+80=
Matematika
filipus20
Pertanyaan
8+10+12+14+......+80=
1 Jawaban
-
1. Jawaban Machzen
A = 8
B = 10-8 = 2
Un = 80
Jumlah suku = 80/2 - 3 = 40 - 3 = 37
S37 :
= 1/2n (a + Un)
= 1/2 x 37 (8 + 80)
= 18,5 x 88
= 1.628