题目内容
计算或化简:
(1)
(2
+4
-3
);
(2)(2
+3
)2-(2
-3
)2;
(3)
-4÷(
-
)-
;
(4)
-
.
(1)
| ||
| 2 |
| 12 |
|
| 48 |
(2)(2
| 3 |
| 2 |
| 3 |
| 2 |
(3)
| 2 | ||
3-
|
| 7 |
| 3 |
| 1 | ||
2+
|
(4)
| a | ||
a-
|
| ||||
|
(1)原式=
×(4
+
-12
)=1-4
;
(2)原式=(2
+3
+2
-3
)(2
+3
-2
+3
)=4
×6
=24
;
(3)原式=
-
-
-2+
=-1-
+
;
(4)原式=
-
=1.
| ||
| 2 |
| 3 |
| 2 |
| 3 |
| 6 |
(2)原式=(2
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 6 |
(3)原式=
3+
| ||
| 3 |
| 7 |
| 3 |
| 3 |
| 7 |
| ||
| 3 |
(4)原式=
| ||||
|
| ||||
|
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