[填空题]
A geometric sequence8/,gnljlla )vi -vy2,nj-zes has 20 terms, with thjvn -a3ktgx b(8u s51ke first four terms given below.
418.5,279,186,124,…
1.Find r, the common ratio of the sequence. Give your answer as a fraction.
$r = \frac{2}{x}$ 那么$x$ =
2.Find $u_5$, the fifth term of the sequence. Give your answer as a fraction.
$u_5= \frac{x}{3}$ 那么$x$ =
3.Find the smallest term in the sequence that is an integer.
$u_4$= .
4.Find $S_10$ , the sum of the first 10 terms of the sequence. Give your answer correct to one decimal place.
$S_10$= .
