问题
解答题
(1)先化简,再求值:
(2)计算:(
|
答案
(1)
+x(1+x2-1 x-1
)1 x
=x+1+x+1
=2x+2,
当x=
-1时,2x+2=22
-2+2=22
.2
(2)(
)-2-(1 2
-1)0+|3
-3|4 3 8
=4-1+|2-3|
=4-1+1
=4.
(1)先化简,再求值:
(2)计算:(
|
(1)
+x(1+x2-1 x-1
)1 x
=x+1+x+1
=2x+2,
当x=
-1时,2x+2=22
-2+2=22
.2
(2)(
)-2-(1 2
-1)0+|3
-3|4 3 8
=4-1+|2-3|
=4-1+1
=4.