15 9 5.4 ( 3.24) (1.944 )
等比数列,前一项乘上0.6等于后一项.
15×0.6=9
9×0.6=5.4
5.4×0.6=3.24
3.24×0.6=1.944 15 9 5.4 ( 3.24) (1.944 )
等比数列,前一项乘上0.6等于后一项.
15×0.6=9
9×0.6=5.4
5.4×0.6=3.24
3.24×0.6=1.944