1.3(13-y)=5y-11=2(x+y). 求這式的聯合二元一次方程..
2.請寫出3/5,7/2的比(答案以最簡形式作答)
數學題 聯合二元一次方程&率及比
2008-01-20 6:53 am
回答 (2)
2008-01-20 8:41 am
✔ 最佳答案
1)3(13-y) = 5y-11
39 - 3y = 5y - 11
50 = 8y
y = 25/4
5y - 11 = 2(x+y)
5y - 11 = 2x + 2y
2x = 3y - 11
2x = 75/4 - 11
2x = 31/4
x = 31/8
so, x = 31/8, y = 25/4
2)
3/5 : 7/2
= 0.6: 3.5
= 6:35
參考: 自己
2008-01-20 7:04 am
2. 3/5 : 7/2 = 6/10 : 35/10 = 6:35
收錄日期: 2021-04-13 14:59:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080119000051KK04322