mathhhhhhhhhhhhh
回答 (3)
2007-09-01 8:24 pm
✔ 最佳答案
(x/x-2)+ (x+1/x+2) =x(x+2)/(x+2)(x-2)+(x+1)(x-2)/(x+2)(x-2)
=(x^2+2x+x^2-x-2)/(x+2)(x-2)
=(2x^2+x-2)/(x^2-4)//
2007-09-01 8:46 pm
(x/x-2)+(x+1/x+2)
=1-2+x+1/x+2
=x+1/x+1
=1-2+x+1/x+2
=x+1/x+1
2007-09-01 8:27 pm
(x/x-2)+ (x+1/x+2)
= (1-2)+(x+1/x+2)x
= -1+x^2+1+2
= x^2+1+2-1
= x^2+3-1
= x^2+2
= (1-2)+(x+1/x+2)x
= -1+x^2+1+2
= x^2+1+2-1
= x^2+3-1
= x^2+2
收錄日期: 2021-04-29 21:49:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070901000051KK01798