题目内容
计算:(
+
-3)(
+
-
)的值等于______.
| 30 |
| 21 |
| 3 |
| 10 |
| 7 |
原式=
[
+(
-
)][(
-(
-
)],
=
[(
)2-(
-
)2],
=
(10-7-3+2
),
=6
.
故答案为:6
.
| 3 |
| 10 |
| 7 |
| 3 |
| 10 |
| 7 |
| 3 |
=
| 3 |
| 10 |
| 7 |
| 3 |
=
| 3 |
| 21 |
=6
| 7 |
故答案为:6
| 7 |
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