作业帮981＋982＋983＋·······987＝984×?
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981＋982＋983＋·······987＝984×?
981＋982＋983＋·······987＝984×?
981＋982＋983＋·······987＝984×?
981＋982＋983＋·······987
=（981+987）+（982+986）+（983+985）+984
=2×984+2×984+2×984+984
=（2+2+2+1）×984
=984×7
4
8
981+987=984*2
982+986=984*2
……
（987+981）*（987-981+1）/2=984*7
981＋982＋983＋·······987＝984×?
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1＋2＋3＋4＋···＋n=?
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1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
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