问题
解答题
(1)计算:(
(2)先化简,再求值:
|
答案
(1)原式=1+5-2×
+2 2
=6;2
(2)原式=
-1 2a
×(a+1)(a-1) (a-1)2 a-1 a(a+1)
=
-1 2a
=-1 a
.1 2a
当a=-
时,1 2
原式=-
=-1 2a
=1.1 2×(-
)1 2
(1)计算:(
(2)先化简,再求值:
|
(1)原式=1+5-2×
+2 2
=6;2
(2)原式=
-1 2a
×(a+1)(a-1) (a-1)2 a-1 a(a+1)
=
-1 2a
=-1 a
.1 2a
当a=-
时,1 2
原式=-
=-1 2a
=1.1 2×(-
)1 2