u7=15 u11=35 berapa un ?
Matematika
tsaniakga1
Pertanyaan
u7=15 u11=35 berapa un ?
1 Jawaban
-
1. Jawaban selina58
U11=35
U7=15
Un?
JAWAB:
U11=a+10b=35
U7=a+6b=15
____________ -
4b=20
b=5
U7=a+6b=15
=a+6(5)=15
=a+30 =15
=a = -15
Un= a+(n-1)b
=-15 + (n-1) 5
= -15 +5n-5
=5n-20