1.-(2-7a)(-2-7a)
2.Local Daily reports that there are 71000 participants in a public
examination this year. In fact, the actual number of participants only 70829.
Find the percentage error of theapproximate number of participants.
(Give your answer correct to 3 significant figures.)
中二數學 急急急~有15點
2010-11-20 5:00 am
回答 (2)
2010-11-20 5:03 am
✔ 最佳答案
-(2-7a)(-2-7a) = (2-7a)(2+7a) = 4-49a^2(71000-70829)/70829=2.41%
2010-11-20 5:07 am
好似係咋...
1) (-2+7a)(-2-7a)
=4-14a+14a-49a
=4-49a,,
2)(71000-70829) x100%
71000
1) (-2+7a)(-2-7a)
=4-14a+14a-49a
=4-49a,,
2)(71000-70829) x100%
71000
收錄日期: 2021-04-18 14:59:18
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https://hk.answers.yahoo.com/question/index?qid=20101119000051KK01206