中三暑期作業﹙數學一題﹚

2007-08-31 4:44 pm
問題係:
aˉ¹ - bˉ¹
-----------------
aˉ² - bˉ²


答案點解係:
ab
-------
a+b


唔該幫幫手,就黎開學.......

回答 (2)

2007-08-31 6:19 pm
✔ 最佳答案
aˉ¹ - bˉ¹
-----------------
aˉ² - bˉ²

=( 1/a - 1/b ) / ( 1/a^2 - 1/b^2)

=( 1/a - 1/b ) / [( 1/a + 1/b) * (1/a - 1/b)]

=1/[( 1/a + 1/b)]

=1/(b+a)/ab
ab
= -------
a+b

=
2007-08-31 4:55 pm
= a+b+c


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