# 查看完整版本 : 咩叫 two times smaller ？

tom.care 2017-12-5 08:59 AM

## 咩叫 two times smaller ？

[img]https://i.imgur.com/u2VqTil.png[/img]https://i.imgur.com/u2VqTil.png

page table 有 512 entries, 所以有 9 bits, 頭 9 bit 顯示 page table index = 001101101= 109，但係 frame number 點計？咩叫 two times less than ？

Susan﹏汪汪 2017-12-5 09:37 AM

tom.care 2017-12-5 12:30 PM

fitcat07 2017-12-5 04:30 PM

My understanding is as follows for bigger:
[list][*]1 time bigger = 100% bigger[*]2 times bigger = 200% bigger (even native English speakers may confuse about this one and consider as 2 times as big as)[/list]

For example, if x is 2 times bigger than y and y is 100, x is 300.
Similarly for smaller but the object to be compared is swapped.
For example if x is 3 times smaller than y and y is 100, x is 25. In other words, y is 3 times bigger than x.

For a), a logical address has 16 bits. The first 9 bits are the page number. The remaining 7 bits are the frame number. As a result:
[list][*]Page number is [b][color=#ff0000]3[/color][/b] times bigger than the frame number; or[*]Frame number is [b][color=#ff0000]3[/color][/b] times smaller than the page number[/list]

I agree that it is very confusable.

fitcat07 2017-12-5 04:40 PM

Mathematically,

x is m times bigger than y:
(x - y) / y = m
=> x = (m + 1) y

x is m times smaller than y:
(y - x) / x = m
=> x = y / (m + 1)

[quote]原帖由 [i]tom.care[/i] 於 2017-12-5 08:59 AM 發表 [url=http://computer.discuss.com.hk/redirect.php?goto=findpost&pid=471922159&ptid=27102271][img]http://computer.discuss.com.hk/images/common/back.gif[/img][/url]
[img]https://i.imgur.com/u2VqTil.png[/img]" border="0" class="ui-resizable-init">

page table 有 512 entries, 所以有 9 bits, 頭 9 bit 顯示 page table index = 001101101= 109，但係 frame number 點計？咩叫 two times less ... [/quote]2 times = 3 !

so weak is your english. had you passed the exams of kindergarden ???:fst_008: