A. 1 over a^ < 1 over b^
B. a^ > b
C. a^ > ab
D. a 3次方 > a^b
已經知道答案是D...但吾明白點解是D..and 需例出詳細步驟來prove that is true ~ Thanks~!! =]
更新1:
^ = 2次方
一條數學MC題~!please(:
2011-04-09 8:10 pm
Given that a and b are non-zero numbers. If a > b, which of the follwing must be true?
A. 1 over a^ < 1 over b^
B. a^ > b
C. a^ > ab
D. a 3次方 > a^b
已經知道答案是D...但吾明白點解是D..and 需例出詳細步驟來prove that is true ~ Thanks~!! =]
A. 1 over a^ < 1 over b^
B. a^ > b
C. a^ > ab
D. a 3次方 > a^b
已經知道答案是D...但吾明白點解是D..and 需例出詳細步驟來prove that is true ~ Thanks~!! =]
回答 (4)
2011-04-10 1:15 am
✔ 最佳答案
A is not true . If a and b are negative number, for example -1 and -2, 1>1/4B is false. if a is 0.1 and b is 0.05, 0.1 x 0.1 = 0.01, < 0.05
C is false. if a is -1 and b is -2, -1 x -1 =1 smaller than -1 x -2 = 2
D is correct. a x a x a > a x a x b , because u can cancel a in both sides, resulting in a>b
can ask me if u do not understand~
2011-04-09 9:54 pm
a^ = a 2次方
2011-04-09 9:26 pm
a^ =??????
收錄日期: 2021-04-23 20:43:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110409000051KK00330