二十點!中二數學指數五條問題,有答案,求步驟!3

2010-02-04 5:07 am
二十點!中二數學指數五條問題,有答案,求步驟!2

請化簡。*唔使做第10題*


問題:http://img62.imageshack.us/img62/431/111kq.png


答案:
11. -9
12.-8
19. x^2/5y^3
20.q^6
21. - 1/s

回答 (1)

2010-02-04 5:33 am
✔ 最佳答案

圖片參考:http://img62.imageshack.us/img62/431/111kq.png

11) = ((- 9)^-3) / 9^-4 = - (9^-3) / 9^4 = - 9^(-3+4) =- 9

12) = (16/25)(-25/2) = - 8

19) = (1/5)(x^2)/y^3 = (x^2)/5y^3

20) = [1(-q)^-3]^-2 = (-q)^6 = q^6

21) = (-r^2)s / (rs)^2 = (-sr^2) / [(s^2)(r^2)] = - s / s^2 =- 1/s


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