问题
解答题
(1)
(2)先化简,再求值:(
|
答案
(1)原式=
+1+33
-1=43
;3
(2)原式=
•x2-6x+2(x+2) x+2 x2+4x+4 x2-4
=
•(x-2)2 x+2 (x+2)2 (x+2)(x-2)
=x-2,
当x=2+
时,原式=2+3
-2=3
.3
(1)
(2)先化简,再求值:(
|
(1)原式=
+1+33
-1=43
;3
(2)原式=
•x2-6x+2(x+2) x+2 x2+4x+4 x2-4
=
•(x-2)2 x+2 (x+2)2 (x+2)(x-2)
=x-2,
当x=2+
时,原式=2+3
-2=3
.3