题目内容
用简便方法计算:(
-1
+
-
)×(-24)
| 7 |
| 24 |
| 3 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
(
-1
+
-
)×(-24),
=
×(-24)+
×24+
×(-24)+
×24,
=-7+33-4+18,
=(33+18)-(7+4),
=40.
| 7 |
| 24 |
| 3 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
=
| 7 |
| 24 |
| 11 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
=-7+33-4+18,
=(33+18)-(7+4),
=40.
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