Maths yes/no question HELP!20點

👨🏻‍🏫 學術台數學

2012-08-22 6:24 am

多位老友,幫幫手比比面唔該,答得幾多到就幾多la~~

1. Multiplication should be always performed before division. Yes/No
2. If A is y% more than B, then B is y% less than A. Yes/No
3. The product of 2 negative numbers must be positive. Yes/No
4. The total number of vertices of a square pyramid and a pentagonal prism is 15. Yes/No

回答 (3)

2012-08-22 4:59 pm

To Pessimist：
既然你 define 咗 -5i 係負數，那這個數
-5i + 6
係正數定負數？丨

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2012-08-22 7:54 am

To 002, number contain "i" cannot be determined +ve or -ve.

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2012-08-22 7:00 am

3 should not be a must to be correct.

e.g. (-5i)(-4i)
= -20

2012-08-21 23:03:31 補充：
因為你冇講明個number要係real定complex.
i = 開方 -1

參考: , 自己

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