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↑只是18定22條
18,22 只是2條XD
2008-09-08 4:33 am
回答 (2)
2008-09-08 4:43 am
✔ 最佳答案
As follow AS~~18
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21
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2008-09-07 21:01:01 補充：
上面是22不是21
2008-09-08 4:59 am
(18) 49x^2 - 1/9 = 0
(7x - 1/3)(7x + 1/3) = 0
7x = 1/3 or -1/3
x = 1/21 or -1/21
(22) (3 - x/4)^2 = 26
(3 - x/4) = √26 or -√26
x/4 = 3 + √26 or 3 - √26
x = 12 + 4√26 or 12 - 4√26
(7x - 1/3)(7x + 1/3) = 0
7x = 1/3 or -1/3
x = 1/21 or -1/21
(22) (3 - x/4)^2 = 26
(3 - x/4) = √26 or -√26
x/4 = 3 + √26 or 3 - √26
x = 12 + 4√26 or 12 - 4√26
收錄日期: 2021-04-23 20:34:34
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080907000051KK02531