數學:特飲,,,,,,,,,,,

共可做特飲
4.85 / 0.3
= (4 + 85/100) / (3/10)
= (4 + 17/20) / (3/10)
= (80/20 + 17/20) / (3/10)
= (97/20) / (3/10)
= (97/20) x (10/3)
= 97/6
= 16 + 1/6 杯
答 :
共可做特飲 16 杯 ,
餘下果汁 1/6 杯 = 0.3 x 1/6 升 = (3/10) x 1/6 升 = 1/20 升

共可做特飲:
4.85/0.3
=(485/100)/(3/10)
=485/100/3*10
=485/10/3
=485/30
=93/6
=31/2
=15+1/2

共可做特飲15杯。

餘下:
(1/2)*0.3
=(1/2)*(3/10)
=(1*3)/(2*10)
=3/20

餘下3/20(0.15)升

2010-05-09 07:22:44 補充：
對不起，算錯了。
應是:

共可做特飲:
4.85/0.3
=(485/100)/(3/10)
=485/100/3*10
=485/10/3
=485/30
=97/6
=16+1/6

共可做特飲16杯。

餘下:
(1/6)*0.3
=(1/6)*(3/10)
=(1*3)/(6*10)
=3/60
=1/20

餘下1/20(0.05)升