how to do it????P.5

2007-03-28 4:43 am

回答 (2)

2007-03-28 5:11 am
✔ 最佳答案
(1)先將9kg分成兩袋,每袋4.5kg~

(天平兩面各畫白米 4.5kg)

(2)再將4.5kg分一半,一份2.25kg~

( 天平兩面各畫白米 2.25kg)

(3)用200g+50g砝碼量0.25kg

(一面畫200g+50g砝碼,一面畫米0.25kg)

最後,由(3)拿走的米,便有2kg~

2007-03-27 21:14:37 補充:
4.5kg=4500g2.25kg=2250g

2007-03-27 21:14:48 補充:
4.5kg=4500g2.25kg=2250g
參考: Mine
2007-03-28 5:01 am
(1) (由左到右): 4500 (不用畫法碼); 4500 (畫白米); 4500

(2) (由左到右): 2250 (不用畫法碼); 2250 (畫白米); 每袋重2250g。

(3) (由左到右): 250 (畫橙色和綠色法碼); 250 (畫白米); 最後,把那袋白米慢慢倒出,直至天秤跟兩個法碼(共250g)平衡。剩下的就是2公斤的白米。

2007-03-28 22:14:33 補充:
兩個都好,咁我答先,又唔揀我??


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