题目内容

计算:
(1)9
3
-7
12
+5
48
       
(2)(5+
6
)(5
2
-2
3
)

(3)
2
(
8
-
50
+
18
)

(4)
32
-3
1
2
+
1
8

(5)|-
1
2
|+
18
-2-1+
3-8

(6)
12
+(2-
3
)-1-(
1
5
)0

(7)
1
3
+
24
-
6
2
+(1-
2
)(1+
2
)

(8)
18
+
1
2
12
-6
1
2
+4
0.75

(9)|1-
2
|+|
2
-
3
|+|
3
-
4
|

(10)
(
3
-2)
2
+(
3
-2)2011(
3
+2)2012
考点:二次根式的混合运算,零指数幂,负整数指数幂
专题:
分析:(1)(4)(5)(6)(8)(9)先化简,再进一步合并同类二次根式;
(2)利用多项式的乘法展开计算;
(3)类比单项式乘多项式展开计算;
(7)利用平方差计算,进一步化简计算;
(10)利用积的乘方和幂的乘方计算,再进一步合并同类二次根式.
解答:解:(1)9
3
-7
12
+5
48

=9
3
-14
3
+20
3

=15
3

       
(2)(5+
6
)(5
2
-2
3
)

=25
2
-10
3
+10
3
-6
2

=19
2


(3)
2
(
8
-
50
+
18
)

=4-10+6
=0;

(4)
32
-3
1
2
+
1
8

=4
2
-
3
2
2
+
2
4

=
11
4
2


(5)|-
1
2
|+
18
-2-1+
3-8

=
1
2
+3
2
-
1
2
-2
=3
2
-2;

(6)
12
+(2-
3
)-1-(
1
5
)0

=2
3
+2+
3
-1
=3
3
+1;

(7)
1
3
+
24
-
6
2
+(1-
2
)(1+
2
)

=
3
3
+
2
6
-
6
2
+(1-2)
=
3
3
+
3
-1
=
4
3
3
-1;

(8)
18
+
1
2
12
-6
1
2
+4
0.75

=3
2
+
3
-3
2
+2
3

=3
3


(9)|1-
2
|+|
2
-
3
|+|
3
-
4
|

=
2
-1+
3
-
2
+2-
3

=1;

(10)
(
3
-2)
2
+(
3
-2)2011(
3
+2)2012

=2-
3
+[(
3
-2)(
3
+2)]2011
3
+2)
=2-
3
+[-(
3
+2)]
=2-
3
-
3
-2
=-2
3
点评:此题考查二次根式的混合运算,先化简,再合并同类二次根式,注意选择合适的方法简算.
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