bantu MTK kelas 11 ga usah pake cara asalkan benar
Jawaban No 1
a = 7
b = 5 - 7 = - 2
Un = a + (n - 1) ( - 2 )
= 7 - 2n + 2
= - 2n + 9
U55
= - 2 ( 55 ) + 9
= - 110 + 9
= - 101
Jawaban No 2
a = 3
U9 = 31
a + 8b = 31
3 + 8b = 31
8b = 28
b = 28/8
b = 3,5
U7
= a + 6b
= 3 + 6 (3,5)
= 3 + 21
= 24
