题目内容
计算:
(1)2
÷
×
;
(2)(4
-3
)÷2
;
(3)2
+3
-
-
;
(4)(7+4
)(7-4
)-(3
-1)2;
(5)(1+
)2(1+
)2(1-
)2(1-
)2.
(1)2
| 12 |
| 1 |
| 2 |
| 50 |
| 1 |
| 2 |
|
(2)(4
| 2 |
| 6 |
| 2 |
(3)2
| 12 |
1
|
5
|
| 2 |
| 3 |
| 48 |
(4)(7+4
| 3 |
| 3 |
| 5 |
(5)(1+
| 2 |
| 3 |
| 2 |
| 3 |
(1)原式=4
÷
×
=
×
=
;
(2)原式=4
÷2
-3
÷2
=2-
;
(3)原式=4
+2
-
-
=2
;
(4)原式=72-(4
)2-(46-6
)=49-48-46+6
=-45+6
;
(5)原式=[(1+
)(1-
)] 2[(1+
)(1-
)] 2=4.
| 3 |
5
| ||
| 2 |
| ||
| 4 |
8
| ||
5
|
| ||
| 4 |
3
| ||
| 5 |
(2)原式=4
| 2 |
| 2 |
| 6 |
| 2 |
3
| ||
| 2 |
(3)原式=4
| 3 |
| 3 |
4
| ||
| 3 |
8
| ||
| 3 |
| 3 |
(4)原式=72-(4
| 3 |
| 5 |
| 5 |
| 5 |
(5)原式=[(1+
| 2 |
| 2 |
| 3 |
| 3 |
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