题目内容
(1)-32-(-| 1 |
| 2 |
| 3 |
| 27 |
(2)
1
|
| 3 |
| 1 |
| 2 |
| 10 |
(3)2
| 3 |
| 72 |
| 50 |
(4)
| 3 |
|
2
|
(5)(3
| 12 |
|
| 48 |
| 3 |
(6)(
| 27 |
|
| 12 |
|
| 45 |
(7)
| 8 |
|
|
(8)(
| 48 |
| 1 |
| 4 |
| 12 |
| 27 |
(9)2
| 3 |
| 72 |
| 50 |
(10)(π-2009)0+
| 12 |
| 3 |
(11)(
| 3 |
| 1 |
| 3 |
| ||
| 2 |
| 12 |
(12)
| ||
| 2 |
| 1 |
| 2 |
| 2 |
| 3 |
| 32 |
| 1 | ||
|
分析:进行二次根式的混合运算时,要理解0指数,负整数幂运算的意义,去绝对值的方法,分配律的灵活运用,二次根式的化简,合并等知识.
解答:解:(1)-32-(-
)-3-|1-
|+
=-9+8+1-
+3
=2
;
(2)
×2
×(-
)=-2×
×
=-4
;
(3)2
(
-2
)=2
(6
-10
)=-8
;
(4)
(
+
)=
+
=1+2
;
(5)(3
-2
+
)÷2
=6
÷2
-
÷2
+4
÷2
=3-
+2=
;
(6)(
+
) -(
-
+
)=3
+
-2
+
-3
=
-
;
(7)
+
-2
=2
+
-
=
+
;
(8)(
+
)÷
=(4
+
)÷3
=
÷3
=
;
(9)2
(
-2
)=2
(6
-10
)=-8
;
(10)(π-2009)0+
+|
-2|=1+2
+2-
=3+
;
(11)(
-2)0+(
)-1+4×
-|-
|=1+3+2
-2
=4+2
-2
;
(12)
•(-
)-2?-(2
-
)0+|-
|+
=
×4-1+4
+
+1=7
.
| 1 |
| 2 |
| 3 |
| 27 |
| 3 |
| 3 |
| 3 |
(2)
1
|
| 3 |
| 1 |
| 2 |
| 10 |
| 1 |
| 2 |
|
| 3 |
(3)2
| 3 |
| 72 |
| 50 |
| 3 |
| 2 |
| 2 |
| 6 |
(4)
| 3 |
|
2
|
3×
|
3×
|
| 2 |
(5)(3
| 12 |
|
| 48 |
| 3 |
| 3 |
| 3 |
2
| ||
| 3 |
| 3 |
| 3 |
| 3 |
| 1 |
| 3 |
| 14 |
| 3 |
(6)(
| 27 |
|
| 12 |
|
| 45 |
| 3 |
| ||
| 3 |
| 3 |
| ||
| 5 |
| 5 |
4
| ||
| 3 |
14
| ||
| 5 |
(7)
| 8 |
|
|
| 2 |
| ||
| 3 |
| 2 |
| 2 |
| ||
| 3 |
(8)(
| 48 |
| 1 |
| 4 |
| 12 |
| 27 |
| 3 |
2
| ||
| 4 |
| 3 |
9
| ||
| 2 |
| 3 |
| 3 |
| 2 |
(9)2
| 3 |
| 72 |
| 50 |
| 3 |
| 2 |
| 2 |
| 6 |
(10)(π-2009)0+
| 12 |
| 3 |
| 3 |
| 3 |
| 3 |
(11)(
| 3 |
| 1 |
| 3 |
| ||
| 2 |
| 12 |
| 2 |
| 3 |
| 2 |
| 3 |
(12)
| ||
| 2 |
| 1 |
| 2 |
| 2 |
| 3 |
| 32 |
| 1 | ||
|
| ||
| 2 |
| 2 |
| 2 |
| 2 |
点评:熟练掌握二次根式的化简,0指数、负指数指数幂及绝对值的运算,灵活运用运算律解题.在加减的过程中,有同类二次根式的要合并;相乘的时候,被开方数简单的直接让被开方数相乘,再化简;较大的也可先化简,再相乘,灵活对待.
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