-128,64,-32,16,-8,4,-2,1,-½,···第n个数是急需···················

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-128,64,-32,16,-8,4,-2,1,-½,···第n个数是急需···················
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-128,64,-32,16,-8,4,-2,1,-½,···第n个数是急需···················
-128,64,-32,16,-8,4,-2,1,-½,···第n个数是
急需···················

-128,64,-32,16,-8,4,-2,1,-½,···第n个数是急需···················
(-1)^n*128*(1/2)^(n-1)
就是(-1)的n次方 乘上128 再乘(1/2)的n-1次方

(-1)^n*128*(1/2)^(n-1)

128÷(2n)
这个题只需写算式不用作答的

n为奇数,是-128/2^(n-1)
n为偶数,是 128/2(n-1)

(-1)的N方×2的N-8方