我数学没学好，豆瓣能不能教教我[笑cry][笑cry]@豆瓣
503×0.095=47.785×10=477.85
503×0.042=21.126×8=169.008
503×0.006=3.018×6=18.108
503×0.03=15.09×4=60.36
506×0.827=418.462×2=836.924
477.85+169.008+18.108+60.36+836.924=1562.25/503=3.105864811≈3.11≈8.2？？？ ​