Can anyone help me with these question??
Thank you.....
Math help!!!!?
回答 (2)
2018-01-17 4:30 pm
(x + h)^2 - x^2 =>
x^2 + 2hx + h^2 - x^2 =>
2hx + h^2
(2hx + h^2) / h =>
2x + h
h goes to 0
2x
3x / (7x - 1) =>
3x / (x * (7 - 1/x)) =>
3 / (7 - 1/x)
x goes to infinity
3 / (7 - 1/inf) =>
3 / (7 - 0) =>
3/7
x^2 + 2hx + h^2 - x^2 =>
2hx + h^2
(2hx + h^2) / h =>
2x + h
h goes to 0
2x
3x / (7x - 1) =>
3x / (x * (7 - 1/x)) =>
3 / (7 - 1/x)
x goes to infinity
3 / (7 - 1/inf) =>
3 / (7 - 0) =>
3/7
收錄日期: 2021-04-18 18:02:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20180117081818AAywTe4