题目内容
计算:
(1)9
-7
+5
(2)(5+
)(5
-2
)
(3)
(
-
+
)
(4)
-3
+
(5)|-
|+
-2-1+
(6)
+(2-
)-1-(
)0
(7)
+
+(1-
)(1+
)
(8)
+
-6
+4
(9)|1-
|+|
-
|+|
-
|
(10)
+(
-2)2011(
+2)2012.
(1)9
| 3 |
| 12 |
| 48 |
(2)(5+
| 6 |
| 2 |
| 3 |
(3)
| 2 |
| 8 |
| 50 |
| 18 |
(4)
| 32 |
|
|
(5)|-
| 1 |
| 2 |
| 18 |
| 3 | -8 |
(6)
| 12 |
| 3 |
| 1 |
| 5 |
(7)
|
| ||||
|
| 2 |
| 2 |
(8)
| 18 |
| 1 |
| 2 |
| 12 |
|
| 0.75 |
(9)|1-
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
(10)
(
|
| 3 |
| 3 |
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.
(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
-7
+5
=9
-14
+20
=15
;
(2)(5+
)(5
-2
)
=25
-10
+10
-6
=19
;
(3)
(
-
+
)
=4-10+6
=0;
(4)
-3
+
=4
-
+
=
;
(5)|-
|+
-2-1+
=
+3
-
-2
=3
-2;
(6)
+(2-
)-1-(
)0
=2
+2+
-1
=3
+1;
(7)
+
+(1-
)(1+
)
=
+
+(1-2)
=
+
-1
=
-1;
(8)
+
-6
+4
=3
+
-3
+2
=3
;
(9)|1-
|+|
-
|+|
-
|
=
-1+
-
+2-
=1;
(10)
+(
-2)2011(
+2)2012
=2-
+[(
-2)(
+2)]2011(
+2)
=2-
+[-(
+2)]
=2-
-
-2
=-2
.
| 3 |
| 12 |
| 48 |
=9
| 3 |
| 3 |
| 3 |
=15
| 3 |
(2)(5+
| 6 |
| 2 |
| 3 |
=25
| 2 |
| 3 |
| 3 |
| 2 |
=19
| 2 |
(3)
| 2 |
| 8 |
| 50 |
| 18 |
=4-10+6
=0;
(4)
| 32 |
|
|
=4
| 2 |
| 3 |
| 2 |
| 2 |
| ||
| 4 |
=
| 11 |
| 4 |
| 2 |
(5)|-
| 1 |
| 2 |
| 18 |
| 3 | -8 |
=
| 1 |
| 2 |
| 2 |
| 1 |
| 2 |
=3
| 2 |
(6)
| 12 |
| 3 |
| 1 |
| 5 |
=2
| 3 |
| 3 |
=3
| 3 |
(7)
|
| ||||
|
| 2 |
| 2 |
=
| ||
| 3 |
2
| ||||
|
=
| ||
| 3 |
| 3 |
=
| 4 |
| 3 |
| 3 |
(8)
| 18 |
| 1 |
| 2 |
| 12 |
|
| 0.75 |
=3
| 2 |
| 3 |
| 2 |
| 3 |
=3
| 3 |
(9)|1-
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
=
| 2 |
| 3 |
| 2 |
| 3 |
=1;
(10)
(
|
| 3 |
| 3 |
=2-
| 3 |
| 3 |
| 3 |
| 3 |
=2-
| 3 |
| 3 |
=2-
| 3 |
| 3 |
=-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.
练习册系列答案
相关题目