Cara cepat menghitung (1+2+3+4+...+100
Matematika
Davinaazt
Pertanyaan
Cara cepat menghitung (1+2+3+4+...+100
2 Jawaban
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1. Jawaban BSunShine
Memakai rumus Jumlah suku ke - n
Un = U1 + (n - 1) b
100 = 1 + (n - 1)1
100 - 1 = n - 1
99 + 1 = n
100 = n
Sn = n/2 (2 . U1 + (n - 1) b)
S100 = 100/2 ( 2.1 + (100 -1 )1)
S100 = 50 ( 2 + 99 . 1)
S100 = 50 ( 2 + 99 )
S100 = 50 ( 101 )
S100 = 5050 -
2. Jawaban luthfiyyahzahroh
100-1-2-3-4=
99-2-3-4
97-3-4
94-4
=90