问题
解答题
(1)计算:2-1+(
(2)先化简,再求值:
|
答案
(1)原式=
+1+1 2
=2;1 2
(2)原式=
+x+3 x2-9 3 x-3
=
+1 x-3 3 x-3
=
.4 x-3
当x=-1时,原式=-1.
(1)计算:2-1+(
(2)先化简,再求值:
|
(1)原式=
+1+1 2
=2;1 2
(2)原式=
+x+3 x2-9 3 x-3
=
+1 x-3 3 x-3
=
.4 x-3
当x=-1时,原式=-1.