问题
解答题
计算或化简: (1)
(2)
(3)(6
(4)已知:x=
|
答案
(1)
-8
(2
+2),2
=2
-2-22
,2
=-2;
(2)
+2
-13
-(27
-1)0+(-2)-2-33
,1 3
=
+1+33
-1+3
-1 4
,3
=3
+3
;1 4
(3)(6
-2xx 4
)÷31 x
,x
=(3
-2x
)÷3x
,x
=
;1 3
(4)∵x=
=2
-13
+1,3
∴x2-x+1,
=(
+1)2-(3
+1)+1,3
=4+2
-3
-1+1,3
=4+
.3