题目内容
计算下列各式:
(1)9
+7
-5
;
(2)[
(1+
)]2-(
-
)2.
(1)9
| 3 |
| 12 |
| 48 |
(2)[
| 2 |
| 3 |
| 2 |
| 6 |
(1)原式=9
+14
-20
=3
;
(2)原式=(
+
) 2-(
-
) 2,
=(
+
+
-
)(
+
-
+
),
=2
×2
,
=4
,
=8
.
| 3 |
| 3 |
| 3 |
| 3 |
(2)原式=(
| 2 |
| 6 |
| 2 |
| 6 |
=(
| 2 |
| 6 |
| 2 |
| 6 |
| 2 |
| 6 |
| 2 |
| 6 |
=2
| 2 |
| 6 |
=4
| 12 |
=8
| 3 |
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