问题
解答题
计算：
|
答案
原式=
-a2 a-1 (a+1)(a-1) a-1
=a2-a2+1 a-1
=
．1 a-1
搜题请搜索小程序“爱下问搜题”
计算：
|
原式=
-a2 a-1 (a+1)(a-1) a-1
=a2-a2+1 a-1
=
．1 a-1
小题2:We will go on a _______ in the mountain. Let’s meet at the school gate. 小题3:Much of the land is ________ by forest. 小题4:On Friday afternoons, many students are ________ after a long week of classe5. 小题5:The ________ of the orange flowers is nice. |