Tolong carikan rumus deret aritmatika ini!! 30, 70, 120, 180, 250, 330, 420, 520 bantuannya ya tolon.... Question from @imicad

November 2018 2 46 Report

Tolong carikan rumus deret aritmatika ini!!

30, 70, 120, 180, 250, 330, 420, 520

bantuannya ya tolong!! tolong bangeeett!!!

anggaferdi Un = 30n + (1/2n . (n-1)) . 10

0 votes Thanks 1

ataSHKJ Menggunakan rumus deret aritmatika bertingkat

Un=a+(n-1)b+(n-1)(n-2)c/2
Un=30+(n-1)40+(n-1)(n-2)10/2
Un=30+40n-40+5n²-15n+10
Un=5n²+25n

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