tolong bantuannya kak, Terimakasih....
Jawab:
barisan dan deret geometri
(1).
t = 80 cm
r = 1/2
tinggi pantulan = a = 1/2 x 80 = 40
panjang lintasan = t + 2 S~
[tex]\rm = t +2( \dfrac{a}{1- r})[/tex]
= 80 + 2(40)/ (1 - 1/2)
= 80 + 80 /1/2
= 80 + 160
= 240cm
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*caralain
t= 80
r= 1/2
panjang pantulan = (2+ 1)/(2 - 1) x 80
= 3x 80
= 240 cm
(2)
deret konvergen (x - 1) + (x- 1)² + ( x- 1)³ + . . .
r = u2/u1
r= (x- 1)²/(x- 1)
r= x - 1
konvergen jika - 1 < r < 1
-1 < x - 1 < 1
0 < x < 2
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