这个.an=(-1)的(n+1)次方*n
找规律1,-2,3,-4,5,-6,7,-8,9,-10..
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1、找规律:(1)6☆1=10,8☆2=12,5☆2=6,9☆8=( )(2)2☆2=7,5☆7=38,6☆5=33,4