1 |
6 |
∴12+22+32+…+1002=22+42+62+…+1002+(12+32+52+…+992)
1 |
6 |
又∵22+42+62+…+1002-(12+32+52+…+992)
=(22-12)+(42-32)+(62-52)+…+(1002-992)
=(2+1)(2-1)+(4-3)(4+3)+(6+5)(6-5)+…+(100+99)(100-99)
=(2+1)+(4+3)+(6+5)+…+(100+99)
=5050;
∴22+42+62+…+1002=
338350+5050 |
2 |
故答案為:171700.