题目内容
计算:
1992+
-1
+2
-3
+4
-5
+…+1990
-1991
=______.
1992+
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| 2 |
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| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
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| 2 |
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1992+
-1
+2
-3
+4
-5
+…+1990
-1991
,
=(2-1)+(4-3)+…+(1992-1991)+(1992÷2)×(
-
),
=996+996×(
-
),
=996+996×
,
=996+166,
=1162;
故答案为:1162.
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| 2 |
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| 1 |
| 2 |
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| 1 |
| 2 |
| 1 |
| 3 |
=(2-1)+(4-3)+…+(1992-1991)+(1992÷2)×(
| 1 |
| 2 |
| 1 |
| 3 |
=996+996×(
| 1 |
| 2 |
| 1 |
| 3 |
=996+996×
| 1 |
| 6 |
=996+166,
=1162;
故答案为:1162.
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