2的0次方+2的1次方+…+2的n次方等于多少?

2024-11-07 20:53:21
推荐回答(3个)
回答1:

等比数列求和

n+1项

回答2:

2^0,2^1,...,2^n

这是一个等比数列,a1=1, q=2 , an= a1.q^(n-1) = 2^(n-1)

2^0+2^1+...+2^n

这是 2^0+2^1+...+2^n =a1+a2+...+a(n+1) =S(n+1) = a1.(q^(n+1) -1)/(q-1)

=(2^(n+1) -1)/(2-1)

化简

=2^(n+1) -1

故得出

2^0+2^1+...+2^n =2^(n+1) -1

回答3:

2^0+2^1+……+2^n
=〔1*(1-2^(n+1))〕/(1-2)
=-(1-2*2^n)
=2*2^n-1