Question

Sebutkan 4 suka pertama dari barisan aritmatika, jika diketahui :
a. u1= -3 , u5= -7
b. u6= 7 , b= 4
c. u1= 10 , u4= 85
d. u5= 11 , u11= 23

Answer 1

A. -3, -4,-5,-6
b. -13,-9,-5,-1
c. 10,35,60,85
c. 3,5,7,9

Answer 2

Yang A :
U5 = -7
U1 = -3 (dikurang)
b.4 = -4
b = -1

U1 = -3
U2 = -3-1= -4
U3 = -4-1 = -5
U4 = -5-1 = -6

Yang B
U6 = a+5b
7 = a+20
a = -13

U1 = -13
U2 = -13+4 = -9
U3 = -9+4 = -5
U4 = -5+4 = -1

Yang C
U4 = a+3b
85 = 10+3b
75 = 3b
b = 25

U1 = 10
U2 = 10+25 = 35
U3 = 35+25 = 60
U4 = 60+25 = 85

Yang D
U11 = 23
U5 = 11 (dikurang)
b.6 = 12
b = 12/6 = 2

nilai a :
U5 = a+4b
11 = a+8
a = 3

U1 = 3
U2 = 3+2 = 5
U3 = 5+2 = 7
U4 = 7+2 = 9