题目内容
计算:
(1)2
+
-
;
(2)
×
÷
;
(3)
÷
-
×
+
;
(4)(
-
)2-(
+
)(
-
).
(1)2
| 3 |
| 27 |
|
(2)
|
| 48 |
|
(3)
| 48 |
| 3 |
|
| 12 |
| 24 |
(4)(
| 2 |
| 3 |
| 3 |
| 2 |
| 3 |
| 2 |
(1)2
+
-
,
=2
+3
-
,
=
;
(2)
×
÷
,
=
×4
×2
,
=8
;
(3)
÷
-
×
+
,
=4-
+2
,
=4+
;
(4)(
-
)2-(
+
)(
-
),
=2-2×
×
+3-(3-2),
=2-2
+3-1,
=4-2
.
| 3 |
| 27 |
|
=2
| 3 |
| 3 |
| ||
| 3 |
=
14
| ||
| 3 |
(2)
|
| 48 |
|
=
| ||
| 2 |
| 3 |
| 2 |
=8
| 3 |
(3)
| 48 |
| 3 |
|
| 12 |
| 24 |
=4-
| 6 |
| 6 |
=4+
| 6 |
(4)(
| 2 |
| 3 |
| 3 |
| 2 |
| 3 |
| 2 |
=2-2×
| 2 |
| 3 |
=2-2
| 6 |
=4-2
| 6 |
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