數學解題Explain your answer briefl
2014-09-14 11:17 pm
The weight of Daniel's sister is half of the weight of Daniel. Can you use a directed number to represent the difference between Daniel's weight and his sister's weight? Explain your answer briefly.
回答 (1)
2014-09-15 2:49 pm
✔ 最佳答案
Let x be the weight of Daniel's sister, then the weight of Daniel = 2x.The difference between Daniel's weight and his sister's weight= 2x - x = x ,
we cann't use a directed number to represent the difference between Daniel's weight and his sister's weight since x is unknown.
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