已知整数a1,a2,a3,a4·····满足下列条件:a1=0,a2=-|a1+1|,a3=-|a2+2|,a4=-|a3+3|,

2025-01-04 00:56:05
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回答1:

a=1,2,3,4,5,6,7,8,9.