题目内容
计算:
(1)
;
(2)(
+
)2;
(3)(
+1)(
-1);
(4)
-
.
(1)
| ||||
|
(2)(
| 2 |
| 3 |
(3)(
| 2 |
| 2 |
(4)
| 8 |
|
(1)
=
-
=
-
=1;
(2)(
+
)2
=(
)2+2
×
+(
)2
=2+2
+3
=5+2
;
(3)(
+1)(
-1)
=(
)2-12
=2-1=1;
(4)
-
=
-
=2
-
=
.
| ||||
|
=
| ||
|
| ||
|
=
| 9 |
| 4 |
=1;
(2)(
| 2 |
| 3 |
=(
| 2 |
| 2 |
| 3 |
| 3 |
=2+2
| 6 |
=5+2
| 6 |
(3)(
| 2 |
| 2 |
=(
| 2 |
=2-1=1;
(4)
| 8 |
|
=
| 4×2 |
|
=2
| 2 |
| ||
| 2 |
=
| 3 |
| 2 |
| 2 |
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