a)令x成為公式y=1/3(x+2)的主項。
b)若y的值增加2,則x值對應地會增加多少？
想問b題點做點寫？
2016-08-16 11:09 am
回答 (1)
2016-08-16 11:26 am
Sol
y=1/[3(x+2)]
3(x+2)y=1
x+2=1/(3y)
x=1/(3y)-2
x+△x=1/[3(y+2)－2
△x=1/[3(y+2)－2－x
=1/[3(y+2)]－1/(3y)
=[y－(y+2)]/[3y(y+2)]
=－2/[3y(y+2)]
y=1/[3(x+2)]
3(x+2)y=1
x+2=1/(3y)
x=1/(3y)-2
x+△x=1/[3(y+2)－2
△x=1/[3(y+2)－2－x
=1/[3(y+2)]－1/(3y)
=[y－(y+2)]/[3y(y+2)]
=－2/[3y(y+2)]
收錄日期: 2021-05-02 10:44:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160816030916AAFMQv8