In the first volume of the fifth grade mathematics, find the rules and fill in the numbers 15 9 5.4 () ()
15 9 5.4 ( 3.24) ( 1.944 )
Geometric series, the former term multiplied by 0.6 equals the latter term.
15×0.6=9
9×0.6=5.4
5.4×0.6=3.24
3.24×0.6= 1.944