求数列:3/2,13/4,41/8.,(2n-1+1/(2^n)).前n项和?RT 2^n表示2的n次方
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![求数列:3/2,13/4,41/8.,(2n-1+1/(2^n)).前n项和?RT 2^n表示2的n次方](/uploads/image/z/110530-10-0.jpg?t=%E6%B1%82%E6%95%B0%E5%88%97%3A3%2F2%2C13%2F4%2C41%2F8.%2C%282n-1%2B1%2F%282%5En%29%29.%E5%89%8Dn%E9%A1%B9%E5%92%8C%3FRT+2%5En%E8%A1%A8%E7%A4%BA2%E7%9A%84n%E6%AC%A1%E6%96%B9)
求数列:3/2,13/4,41/8.,(2n-1+1/(2^n)).前n项和?RT 2^n表示2的n次方
求数列:3/2,13/4,41/8.,(2n-1+1/(2^n)).前n项和?
RT 2^n表示2的n次方
求数列:3/2,13/4,41/8.,(2n-1+1/(2^n)).前n项和?RT 2^n表示2的n次方
3/2=1+1/2
13/4=3+1/4
41/8=5+1/8
……
Sn=(1+3+5+……+2n-1)+(1/2+1/4+1/8……+1/2*n)
=n*2+(1/2)*n