题目内容
(1+
)+(2+
)+(3+
)+…+(96+
)+(97+
).
| 1 |
| 97 |
| 2 |
| 97 |
| 3 |
| 97 |
| 96 |
| 97 |
| 97 |
| 97 |
(1+
)+(2+
)+(3+
)+…+(96+
)+(97+
),
=1+2+3+…+96+97+(
+
+
+…+
+
),
=(1+97)×97÷2+[(1+97)×97÷2×
],
=4753+[4753×
],
=4753+49,
=4802.
| 1 |
| 97 |
| 2 |
| 97 |
| 3 |
| 97 |
| 96 |
| 97 |
| 97 |
| 97 |
=1+2+3+…+96+97+(
| 1 |
| 97 |
| 2 |
| 97 |
| 3 |
| 97 |
| 96 |
| 97 |
| 97 |
| 97 |
=(1+97)×97÷2+[(1+97)×97÷2×
| 1 |
| 97 |
=4753+[4753×
| 1 |
| 97 |
=4753+49,
=4802.
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