1-3+5-7+9-11+13-.-39+41=?
人气:123 ℃ 时间:2020-03-25 05:40:52
解答
一共(41-1)÷2+1=21个数
1-3+5-7+9-11+13-.-39+41
=1+(5-3)+(9-7)+...+(41-39)
=1+2×10
=21
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