Math trouble help 9/x+5 - 6/ x-5?
回答 (4)
2017-05-08 9:53 am
9/(x + 5) - 6/(x - 5)
= 9(x - 5) - 6(x + 5)/(x^2 - 25)
= (3x - 75)/(x^2 - 25)
= 3(x - 25)/(x^2 - 25)
= 9(x - 5) - 6(x + 5)/(x^2 - 25)
= (3x - 75)/(x^2 - 25)
= 3(x - 25)/(x^2 - 25)
2017-05-08 9:49 am
9/x + 5 - 6/x - 5
9/x - 6/x + 5 - 5
9/x - 6/x + 0
3/x + 0
3/x
9/x - 6/x + 5 - 5
9/x - 6/x + 0
3/x + 0
3/x
2017-05-08 9:45 am
9/(x+5) - 6/(x-5)
= [9(x-5) -6(x+5)]/[(x+5)(x-5)]
= (9x-45-6x-30)/(x²-25)
= (3x-75)/(x²-25)
= 3(x-25)/(x²-25)
= [9(x-5) -6(x+5)]/[(x+5)(x-5)]
= (9x-45-6x-30)/(x²-25)
= (3x-75)/(x²-25)
= 3(x-25)/(x²-25)
2017-05-08 9:40 am
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收錄日期: 2021-04-24 00:25:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170508014013AAdrHC6