有括號的次方和無括號的次方數分別
回答 (4)
2009-11-21 7:11 am
✔ 最佳答案
-5^3= - (5^3)
= - (5) (5) (5)
= -125
(-5)^3
= (-5) (-5) (-5)
= (25) (-5) ... (負負得正）
= -125 ... (正負得正)
用單數次方很難看得到分別，如果改用雙數次方：
-5^4
= - (5) (5) (5) (5)
= -625
(-5)^4
= (-5) (-5) (-5) (-5)
= (25) (25) ... (負負得正)
= 625 ... (正正得正)
參考: me
2009-11-21 4:45 pm
(-5)^2 = (-5)(-5)(-5)=-125
-5^2 = -(5)(5)(5) =125
-5^2 = -(5)(5)(5) =125
2009-11-21 11:25 am
小學時在做什麼？
先乘除後加減啊。
先乘除後加減啊。
2009-11-21 9:04 am
(abc)^n = (a^n)(b^n)(c^n)
(-5)^3 = (-1)^3(5^3) = -125
(-5)^4 = (-1)^4(5^4)= 625
(-5)^3 = (-1)^3(5^3) = -125
(-5)^4 = (-1)^4(5^4)= 625
收錄日期: 2021-04-13 16:56:41
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091120000051KK01429