题目内容
计算:
=______.
| (22+42+…+1002)-(12+32+…+992) |
| 1+2+…+10+9+…+1 |
原式=
,
=
,
=
,
=
,
=
,
=50.5.
| (22-12)+(42-32)+(62-52)+…+(1002-992) |
| 102 |
=
| (2+1)×(2-1)+(4+3)×(4-3)+(6+5)×(6-5)+…+(100+99)×(100-99) |
| 102 |
=
| 3+7+11+…+195+199 |
| 100 |
=
| (3+199)×50÷2 |
| 100 |
=
| 101×50 |
| 100 |
=50.5.
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