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回答 (1)
2007-10-10 7:18 am
✔ 最佳答案
2(5-x)=(5-x)(3x+4) 10-2x=15x+20-3x^2-4x
3x^2-13x-10=0
(3x+2)(x-5)=0
x=-2/3 or x=5
收錄日期: 2021-04-13 19:30:21
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https://hk.answers.yahoo.com/question/index?qid=20071009000051KK04727