指數記數法問題

2010-11-28 11:31 pm
比如(-2)的2次方同-2的2次方有咩分別同埋2條點計?
更新1:

002你是慈天葉sir?

回答 (4)

2010-11-28 11:44 pm
✔ 最佳答案
1) ( -2 )^2 = ( -2 )( -2 ) = 4
2) -2^2 = - ( 2^2 ) = -4

The difference is whether the negative sign ( - ) is put into square.
The two answers are numerically equal but opposite in sign.

2010-11-30 21:41:02 補充:
對不起! 我不是慈天葉sir, 香港有許多數學科葉sir的.
參考: Mathematics Teacher Mr. Ip
2010-11-29 3:00 am
(-2)的2次方會等於 4
因為-2被括號括住
咁即係話2次方係for成個-2的

而-2的2次方因冇比括號括住,
2次方只係for 2,所以答案係-4.
參考: me.
2010-11-28 11:45 pm
-9^2=-81

(-9)^2=81
2010-11-28 11:34 pm
sol
(-2)^2=4
-2^2=-(2^2)=-4

2010-11-28 21:25:45 補充:
such that
(-a)^2=a^2
-a^2=-(a^2)
參考: LKPFC 信心保證+Google 計算機的更多資料


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