我要埋步驟... thxxx
1. x/x+y + y/x-y
2. 1/2y+1 + 1/y-1
3. a^2-b^2/a 乘 a^2/a^3+b^3
4. n/m^2-n^2 + mn/m^3-mn^2
5. u/(u+v)^2 乘 u^2-v^2/v
6. 9X/(x-y)^2 - 8/y-x
7. v/u-v - u/u+v
8. 4ax^3+12ax^2/6ax^2
9. 9u^2v/5u-2v 乘 10v-25u/3v^2
10. p^2-pq/q 乘 p^2q/pq-q^2
f.2 數 (化簡)急急急急急!!!thx哂
2007-12-01 5:21 pm
回答 (2)
2007-12-01 5:43 pm
✔ 最佳答案
1. x/x+y + y/x-y你落番D () 得唔得呀, 點知你想問乜呀
x/ (x+y) + y/ (x-y)
= [x(x-y) + y (x+y) ] / x^2 - y^2
= (x^2-xy+xy+y^2)/ x^2 - y^2
= (x^2+y^2 ) / x^2 - y^2
2007-12-01 09:44:04 補充：
= (x^2+y^2 ) /( x^2 - y^2 )
2007-12-01 5:24 pm
xy/y2
收錄日期: 2021-04-13 16:24:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071201000051KK00583