✔ 最佳答案
1.咖啡罐上標[咖啡因含量200PPM],這罐咖啡的含量是0.25G,這罐咖啡有幾G
1ppm=1/1000000
含量重=0.25公克
ppm=200ppm
總重量*ppm*(1/1000000)=含量重
總重量*200*(1/1000000)=0.25
總重量=(0.25/200)*1000000=0.00125*1000000=1250公克
答案:咖啡有幾1250公克
算出百分率
2100 4500 6000 600 1800 合計15000
?% ?% ?% ?% ?% 合計100%
總數=15000
2100百分率=(2100/總數)*100%
=(2100/15000)*100%
=0.14*100%
=14%
4500百分率=(4500/總數)*100%
=(4500/15000)*100%
=0.3*100%
=30%
6000百分率=(6000/總數)*100%
=(6000/15000)*100%
=0.4*100%
=40%
600百分率=(600/總數)*100%
=(600/15000)*100%
=0.04*100%
=4%
1800百分率=(1800/總數)*100%
=(1800/15000)*100%
=0.12*100%
=12%