KK tolong di jawab ya... no 17 dan 18 pakai cara juga
Jawaban:
17. Nilai Ulangan ke 5 = x
Rata-Rata = 10 + 8 + 9 + 6 + x / 5
8 = (33 + x) / 5
8 x 5 = 33 + x
40 = 33 + x
x = 40 - 33
x = 7
18. Nilai Ulangan ke 6 = x
Rata-Rata = 7 + 8 + 7 + 6 + 8 + x / 6
7,5 = (36 + x) / 6
7,5 x 6 = 36 + x
45 = 36 + x
x = 45 - 36
x = 9
Semoga Membantuu ^.^
