1/6(r+6)^2 - 1/6 r^2 = 54
(r+6)^2 - r^2 =324 <--------點解會=324?我估係54X6
但點解二個1/6都冇咗既?
可否解答本人之愚笨呢?
更新1:
2個ans都唔明喎~~
2個ans都唔明喎~~
收錄日期: 2021-04-23 22:02:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100405000051KK01155