計算機按法:
1.★0.4☆☆(★★★)=0.16,0...
(0.4^2×0.3)+(0.6^2×0.5)+2×0.4×0.6×0.3
34 由甲和乙兩股票構成的投資組合,其中甲占40%,乙占60%。甲股票報酬率的變..-阿摩線上測驗