1十2十3十4十……十1000
=(1十1000)X1000÷2
二500500
1001x500=500500
500*1001=500500
=(1+1000)x499+500
=499499
标签:等于
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1十2十3十4十……十1000
=(1十1000)X1000÷2
二500500
1001x500=500500
500*1001=500500
=(1+1000)x499+500
=499499
标签:等于