问题
解答题
先化简,再求代数式
|
答案
原式=
÷(a(a+1) (a+1)2
+a-1 a-1
)1 a-1
=
÷a(a+1) (a+1)2 a a-1
=
×a(a+1) (a+1)2 a-1 a
=
,a-1 a+1
又∵a=2tan60°-1=2×
-1=23
-1,3
∴原式=
=2
-1-13 2
-1+13
=1-2
-23 2 3
.3 6
先化简,再求代数式
|
原式=
÷(a(a+1) (a+1)2
+a-1 a-1
)1 a-1
=
÷a(a+1) (a+1)2 a a-1
=
×a(a+1) (a+1)2 a-1 a
=
,a-1 a+1
又∵a=2tan60°-1=2×
-1=23
-1,3
∴原式=
=2
-1-13 2
-1+13
=1-2
-23 2 3
.3 6