Forgot password
 Register account
View 290|Reply 4

[函数] 这个取整符号的b为啥不能取1啊

[Copy link]

41

Threads

60

Posts

0

Reputation

Show all posts

baxiannv posted 2022-5-29 02:53 from mobile |Read mode

题目在右边,左边的a,b,c,d没啥用。
意思是当a≠0是,能不能有这俩点满足条件。

41

Threads

60

Posts

0

Reputation

Show all posts

original poster baxiannv posted 2022-5-29 02:58 from mobile
Last edited by hbghlyj 2025-3-9 01:51$a\lceil b(x-c)\rceil+d$

41

Threads

60

Posts

0

Reputation

Show all posts

original poster baxiannv posted 2022-5-29 03:11 from mobile
Last edited by hbghlyj 2025-3-9 02:12求当a≠0时,b=1时能不能找到对应的x,y(0.5,1)和(1.5,1)

41

Threads

60

Posts

0

Reputation

Show all posts

original poster baxiannv posted 2022-5-29 03:25
Last edited by baxiannv 2022-5-29 03:57c影响平移啊 可以平移0.5个单位可以把俩个点包含在1,这样b还是1呀

3211

Threads

7832

Posts

52

Reputation

Show all posts

hbghlyj posted 2025-3-9 02:10
Since $(0.5, 1)$ and $(1.5, 1)$ are on the graph of $f(x) = a⌈b(x-c)⌉ + d$, this means:
\[f(0.5) = a⌈b(0.5-c)⌉ + d = 1\]
\[f(1.5) = a⌈b(1.5-c)⌉ + d = 1\]
If b = 1, then:
\[a⌈0.5-c⌉ + d = 1\]
\[a⌈1.5-c⌉ + d = 1\]
Subtracting,
\[(⌈1.5-c⌉ - ⌈0.5-c⌉) a =0\]
Using $⌈0.5-c⌉=⌈1.5-c⌉ - 1$,
\[a=0\]which is not allowed.
So, it is not possible for $b = 1$.

Quick Reply

Advanced Mode
B Color Image Link Quote Code Smilies
You have to log in before you can reply Login | Register account

$\LaTeX$ formula tutorial

Mobile version

2025-7-20 05:50 GMT+8

Powered by Discuz!

Processed in 0.020377 seconds, 46 queries