| 1 |
| 2 |
| 2 |
| 2 |
| 3 |
| 2 |
| 49 |
| 2 |
=
| 1 |
| 2 |
=
| 1 |
| 2 |
| 49(1+49) |
| 2 |
=
| 1225 |
| 2 |
计算1/2+(1/4+3/4)+(1/6+3/6+5/6)+…+(1/98+3/98+…+97/98)．
计算
+(
+
)+(
+
+
)+…+(
+
+…+
)．
| 1 |
| 2 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 6 |
| 5 |
| 6 |
| 1 |
| 98 |
| 3 |
| 98 |
| 97 |
| 98 |
数学人气：291 ℃时间：2019-12-09 07:03:07
优质解答
原式=
+
+
+…+
=
（1+2+3+…+49）
=
×
=
．
=
=
=
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