题目内容
计算
(1)(3
+
)(
-4
);
(2)(1-
)2-
+(
)0.
(1)(3
| 2 |
| 48 |
| 18 |
| 3 |
(2)(1-
| 3 |
| 2 | ||
|
| 2 | ||
|
(1)原式=(3
+4
)(3
-4
)
=(3
)2-(4
)2
=18-48
=-30;
(2)原式=(1-
)2-
+1
=(1-
)2-(
-1)+1
=1+3-2
-
+1+1
=6-3
.
| 2 |
| 3 |
| 2 |
| 3 |
=(3
| 2 |
| 3 |
=18-48
=-30;
(2)原式=(1-
| 3 |
2(
| ||||
(
|
=(1-
| 3 |
| 3 |
=1+3-2
| 3 |
| 3 |
=6-3
| 3 |
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