有關directed number課題中的列式問題

2012-08-21 5:46 am
八達通內有10元,買文具用去28元,餘下多少元?
a. (+10)-(+28)
b. 10-28
c. (+10)-28


八達通內有-5元,增值50元後現有多少元?
a. (-5)+(+50)
b. -5+50
c. (-5)+50

回答 (1)

2012-08-21 3:28 pm
✔ 最佳答案
八達通內有10元,買文具用去28元,餘下多少元?
a. (+10)-(+28)
b. 10-28
c. (+10)-28
ans. b
八達通內有-5元,增值50元後現有多少元?
a. (-5)+(+50)
b. -5+50
c. (-5)+50
ans. b
because when the negative number is at the beginning, you don't need to add brackets
參考: me


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