已知序列x(n)={1,0,1,1,1},试计算（1）x(n)*x(n) （2）x(n)⑤x(n) （3）x(n)⑩x(n)

1. x(n)*x(n)表示两个序列的卷积，计算如下：
x(n)*x(n) = {1,0,1,1,1} * {1,0,1,1,1}
= 1*1 + 0*1 + 1*0 + 1*1 + 1*1 + 0*1 + 0*0 + 0*1 + 0*1 + 0*1
= {1,1,2,3,2,1}

2. x(n)⁵表示将序列x(n)连乘5次，计算如下：
x(n)⁵ = x(n) * x(n) * x(n) * x(n) * x(n)
= {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1}
= {1,0,1,1,1,0,1,1,0,0,0,0,0,0,0,0,1,1,0,1}

3. x(n)¹⁰表示将序列x(n)连乘10次，计算如下：
x(n)¹⁰ = x(n) * x(n) * x(n) * x(n) * x(n) * x(n) * x(n) * x(n) * x(n) * x(n)
= {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1} * {1,0,1,1,1}
= {1,0,1,1,1,0,1,1,0,0,1,1,0,1,1,0,1,1,0,1}