题目内容
计算(2
-3
+1
)÷(-1
).
| 1 |
| 3 |
| 1 |
| 2 |
| 4 |
| 45 |
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| 6 |
(2
-3
+1
)÷(-1
)
=(
-
+
)×(-
)
=
×(-
)+(-
)×(-
)+
×(-
)
=-2+3-
=1-
=
.
| 1 |
| 3 |
| 1 |
| 2 |
| 4 |
| 45 |
| 1 |
| 6 |
=(
| 7 |
| 3 |
| 7 |
| 2 |
| 49 |
| 45 |
| 6 |
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=
| 7 |
| 3 |
| 6 |
| 7 |
| 7 |
| 2 |
| 6 |
| 7 |
| 49 |
| 45 |
| 6 |
| 7 |
=-2+3-
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| 1 |
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