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58问答库 > 1+2+3一直加到9999等于多少?

1+2+3一直加到9999等于多少?

有没有人知道答案的

2025-03-15 12:07:00

推荐回答（2个）

回答（1）：

（1+9999 ）*9999/2=499950000

回答（2）：

1+2+3+4+……+9999
=0+1+2+3+4+……+9999+10000-10000
=（0+10000）+（1+9999）+（2+9998）+……（4999+5001）+5000-10000
=10000/2*10000+5000-10000
=49995000

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