kak tlong di jawab fast respon terimakasih

Hai wirayuda ? Apa kabar ?

Aku bantu ya.

a) a = 5 dan b = 4

Un = a + (n-1)b
U12= 5 + 11.4
U12 = 5+ 44
U12 = 49

S12 = n/2 ( a + U12)
S12 = 6 ( 5 + 49 )
S12 = 6 x 54
S12 = 324

b ) a = 21 dan b = -2

Un = a + (n-1)b
U12= 21 + 11.(-2)
U12 = 21+ (-22)
U12 = - 1

S12 = n/2 ( a + (-1))
S12 = 6 ( 21 + (-1) )
S12 = 6 x 20
S12 = 120

c) a = -3 dan b = 3

Un = a + (n-1)b
U12= -3 + 11.3
U12 = -3 + 33
U12 = 30

S12 = n/2 ( a + U12)
S12 = 6 ( -3 + 30 )
S12 = 6 x 27
S12 = 162

d) a = 8 dan b =-5

Un = a + (n-1)b
U12= 8 + 11.(-5)
U12 = 8 + (-55)
U12 = -47

S12 = n/2 ( a + U12)
S12 = 6 ( 8 + (-47) )
S12 = 6 x ( -39 )
S12 = - 234

e) a = 11 dan b = 6

Un = a + (n-1)b
U12 = 11 + 11.6
U12 = 11 + 66
U12 = 77

S12 = n/2 ( a + U12)
S12 = 6 ( 11 + 77 )
S12 = 6 x 88
S12 = 528

Semoga membantu