3(-x^2) 答案係咩...
3(-x^3) 答案係咩...
有少少混淆左 未知數使唔使計埋正負 定直接跟負號做
唔該晒各位.........
更新1:
唔該晒 仲有一個...咁-3(-x^2)同-3(-x^3)答案應該係咩 麻煩晒!!
關於基本正負2次方/3次方問題..
2010-04-15 3:25 am
請問一下..
3(-x^2) 答案係咩...
3(-x^3) 答案係咩...
有少少混淆左 未知數使唔使計埋正負 定直接跟負號做
唔該晒各位.........
3(-x^2) 答案係咩...
3(-x^3) 答案係咩...
有少少混淆左 未知數使唔使計埋正負 定直接跟負號做
唔該晒各位.........
回答 (2)
2010-04-15 3:33 am
✔ 最佳答案
-3x^2-3x^3
(-x^3)is a negative number,3 is a postive number,so the answer must be
negative number.---+=---
2010-04-17 16:40:23 補充：
3x^3
Negative times negative is equal to postive.
2010-04-17 16:41:13 補充：
-3(-x^2)
3x^2
Negative times negative is equal to postive.
2010-04-15 9:06 pm
-3(-x^2) = 3x^2
-3(-x^3) = 3x^3
Give you two more examples
(-x)^2 = x^2
-(-3x)^2 = -(9x^2) = -9x^2
-3(-x^3) = 3x^3
Give you two more examples
(-x)^2 = x^2
-(-3x)^2 = -(9x^2) = -9x^2
收錄日期: 2021-04-25 17:01:51
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100414000051KK01155