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计算:(1)-31+25+(-69)(2)(-12)-(-13)-(+14
1个回答
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(1)-31+25+(-69)=-31+25-69=-75;
(2)(-
)-(-
)-(+
)=-
+
-
=-
+
-
=-
.
(2)(-
1 |
2 |
1 |
3 |
1 |
4 |
1 |
2 |
1 |
3 |
1 |
4 |
6 |
12 |
4 |
12 |
3 |
12 |
5 |
12 |
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