8+10+12+14+......+80=
Matematika
filipus20
Pertanyaan
8+10+12+14+......+80=
2 Jawaban
-
1. Jawaban vinnyfrestia20
8+10+12+14+......+80 = 2n + 6 -
2. Jawaban tommyharyanto72
Memakai deret aritmatika
a = 8
b = 2
Un = a + (n-1)b
80 = 8 + (n-1)2
80 = 8 + 2n - 2
80 = 6 + 2n
74 = 2n
37 = n
Sn = n/2.(a+Un)
S37 = 37/2.(8+80)
S37 = 37/2.88
S37 = 37.44
S37 = 1628
#CMIIW