问题 解答题
计算求值
①(3
48
+
12
-2
27
)÷
3

18
-
9
2
-
3
+
6
3
+(
3
-2)0+
(1-
2
)2

③先化简,再求值:
3
x-3
-
18
x2-9
,其中x=
10
-3
答案

(1)原式=(12

3
+2
3
-6
3
)÷
3
=8
3
÷
3
=8;

(2)原式=3

2
-
3
2
2
-(1+
2
)+1+
2
-1

=

3
2
2
-1;

(3)原式=

3
x-3
-
18
(x-3)(x+3)

=

3(x+3)-18
(x-3)(x+3)

=

3(x-3)
(x-3)(x+3)

=

3
x+3

当x=

10
-3时,原式=
3
10
-3+3
=
3
10
10

单项选择题 A3/A4型题
单项选择题