兩個代數的方程小六 (> . <)
甲乙相差20,甲是乙的3倍,求甲
b- b/3=20
Is this right???
If it's wrong, I would like to know b- b/3=20 's answer!!!!!
步驟必要要要要要要要要要!!!!!!!!!
ORZ........................
兩個代數的方程小六
2011-02-21 5:19 am
回答 (3)
2011-02-21 5:54 am
✔ 最佳答案
甲乙相差20,甲是乙的3倍,求甲設甲為B
設乙為A
B=3A
B/3=A...(1)
B-A=20...(2)
代(1) 入(2)
B-A=20
B-B/3 = 20
3(B-B/3) = 20X3
3B - B/3 X3 = 60
3B-B = 60
2B = 60
B = 30
甲 = 30
(反代入
甲=30
3乙 = 甲
3乙 = 30 ...(1)
乙 = 10
甲-乙 = 20...(2)
30-10 = 20
20 = 20 (OK) )
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110220000051KK01588