maths question
回答 (4)
2013-06-12 3:34 am
✔ 最佳答案
(6+k)(5-k)=6(5-k)+k(5-k)
=30-6k+5k-k^2
=-k^2-k+30
2013-06-13 10:20 pm
(6+k)(5+k)
=30+6k+5k+k²
=30+11k+k²
(=k²+11k+30)
=30+6k+5k+k²
=30+11k+k²
(=k²+11k+30)
2013-06-12 4:30 am
收錄日期: 2021-04-23 23:19:59
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https://hk.answers.yahoo.com/question/index?qid=20130611000051KK00231