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U7 = 26
Ditanya:
beda dan suku pertama
jumlah 12 suku pertama
jawab :
a. beda =
suku pertama = Un = U1 + (n-1)b
14 = U1 + (3-1)3
14 = U1 + 6
14 - 6 = U1
8 = U1
b. Sn = (
S12 =
S12 =
S12 = 6 ( 49 )
S12 = 294
SEMOGA BERMANFAAT :)
u7=a+6b=26_
-4b=-12
b=3
#u3=a+2b=14
a+2*3=14
a+6=14
a=14-6
a=8
#u12=a+11b
=8+33
=41
#s12=1/2* 12+(a+U12)
=6+(8+41)
=6+49
=55