若x≥6,試以不等式表示y值的範圍
1.y=-7x
2.y=-1/5(2-x)
中三不等式
2008-11-20 1:38 am
回答 (2)
2008-11-20 3:27 am
2008-11-20 1:50 am
1. X>= 6,
Y/-7 >= 6
Y <= -42
2. Y= -1/5(2-X)
-5Y = 2-X
X = 2 + 5Y
X >= 6
2 + 5Y >= 6
5Y >= 4
Y >= 4/5
Y/-7 >= 6
Y <= -42
2. Y= -1/5(2-X)
-5Y = 2-X
X = 2 + 5Y
X >= 6
2 + 5Y >= 6
5Y >= 4
Y >= 4/5
收錄日期: 2021-04-15 01:24:02
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081119000051KK00958