题目内容
计算或化简:
(1)(2
+
-
)÷
(2)2n
-
+
(3)(2
+
)(2
-
)+(
-
)2.
(1)(2
| 54 |
| 48 |
| 32 |
| 27 |
(2)2n
|
| 6 |
| mn |
| m3n3 |
| 5 |
| m |
| m3n |
(3)(2
| 2 |
| 3 |
| 2 |
| 3 |
| 5 |
| 3 |
(1)原式=2
+
-
,
=2
+
-
;
(2)原式=2
-6
+5
,
=
;
(3)原式=(2
)2-(
)2+5-2
+3,
=8-3+5-2
+3,
=13-2
.
| 54÷27 |
| 48÷27 |
| 32÷27 |
=2
| 2 |
| 4 |
| 3 |
| 4 |
| 9 |
| 6 |
(2)原式=2
| mn |
| mn |
| mn |
=
| mn |
(3)原式=(2
| 2 |
| 3 |
| 15 |
=8-3+5-2
| 15 |
=13-2
| 15 |
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