找规律 -3,-1,1,3,5,7,9…… ,第n个数是_____
找规律 -3,-1,1,3,5,7,9…… ,第n个数是_____
找规律 5,3,1,-1,-3,-5……,第n个数是_____
找规律 5,3,1,-1,-3,-5……,第n个数是_____
数学人气：877 ℃时间：2019-11-02 13:04:35
优质解答
1 、第n个数=2n-5 2、第n个数=-2n+7太对了
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