✔ 最佳答案
x+3 over 3 + 2x- 4 over 5 = 14 over 15
(x+3)/3 + (2x- 4)/ 5 = 14 / 15
5(x+3) +3(2x-4) =14......................................一齊乘15
5x+15 +6x-12 =14
11x=11
x=1
2008-11-23 15:19:38 補充:
樓上 你錯左啦- -
要留心"先乘除,後加減"
x+3/3 + 2x-4/5 = 14/15會變左x+1 + 2x -0.8 = 14/15
2008-11-23 16:13:51 補充:
樓下 你都錯左啦- -
係11x=11 吳係11x=1........