no 9)
manual aja kk..
2,6,12,20,..
+4+6+8+10+12+14+16+18
u5 = 20 + 10 = 30
u6 = 30 + 12 = 42
u7 = 42 + 14 = 56
u8 = 56 + 16 = 72
u9 = 72 + 18 = 90
no 10)
3,7,12,..
+4+5+6+7
u4 = 12 + 6 = 18
u5 = 18 + 7 = 25
no 11)
4,12,24
+8+12+..
+4+..
a = 4, b = 8, c = 4
Un = 4 + 8(n-1) + 4(n-1)(n-2)/2
Un = 4 + 8n -8 + 2(n²-3n+2)
Un = 8n -4 + 2n² - 6n + 4
Un = 2n² + 2n
U10 = 2(10)² + 2(10)
U10 = 200 + 20
U10 = 220
maaf kk klo salah..
Jawaban:
10. C
11. C
Penjelasan dengan langkah-langkah:
Silahkan lihat gambar, semoga membantu :)
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no 9)
manual aja kk..
2,6,12,20,..
+4+6+8+10+12+14+16+18
u5 = 20 + 10 = 30
u6 = 30 + 12 = 42
u7 = 42 + 14 = 56
u8 = 56 + 16 = 72
u9 = 72 + 18 = 90
no 10)
3,7,12,..
+4+5+6+7
u4 = 12 + 6 = 18
u5 = 18 + 7 = 25
no 11)
4,12,24
+8+12+..
+4+..
a = 4, b = 8, c = 4
Un = 4 + 8(n-1) + 4(n-1)(n-2)/2
Un = 4 + 8n -8 + 2(n²-3n+2)
Un = 8n -4 + 2n² - 6n + 4
Un = 2n² + 2n
U10 = 2(10)² + 2(10)
U10 = 200 + 20
U10 = 220
maaf kk klo salah..
Jawaban:
10. C
11. C
Penjelasan dengan langkah-langkah:
Silahkan lihat gambar, semoga membantu :)