香港寵物小精靈村落 論壇
標題:
中三指數定律
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作者:
雪散霞花
時間:
5/10/2008 06:10 PM
標題:
中三指數定律
化簡下列數式~並以正指數表示答案~而a=/=0~
(2a^-2+a^-2)^3
我既答案係
27
8a^6
但係正確答案係
27
a^6
作者:
sapphire
時間:
5/10/2008 06:40 PM
[2a^(-2) + a^(-2)]^3
= [(2 + 1)a^(-2)]^3
= [3a^(-2)]^3
= 27a^(-6)
= 27 / a^6
The answer is correct.
It seems that you miscalculate and give out an extra 1/2. Then after the power of 3, it gives out 1/8. Try to find the error by checking each step.
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本帖最後由 sapphire 於 5/10/2008 06:44 PM 編輯
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