1+(1+ⅰ)+(1+ⅰ)²+(1+ⅰ)³+.+.(1+ⅰ)n-1=多少 (n-1是次方)

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1+(1+ⅰ)+(1+ⅰ)²+(1+ⅰ)³+.+.(1+ⅰ)n-1=多少 (n-1是次方)
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1+(1+ⅰ)+(1+ⅰ)²+(1+ⅰ)³+.+.(1+ⅰ)n-1=多少 (n-1是次方)
1+(1+ⅰ)+(1+ⅰ)²+(1+ⅰ)³+.+.(1+ⅰ)n-1=多少 (n-1是次方)

1+(1+ⅰ)+(1+ⅰ)²+(1+ⅰ)³+.+.(1+ⅰ)n-1=多少 (n-1是次方)
1+(1+ⅰ)+(1+ⅰ)²+(1+ⅰ)³+.+.(1+ⅰ)^(n-1)=
=[(1+ⅰ)^n-1]/(1+i-1)=[(1+ⅰ)^n-1]/i=i-i(1+ⅰ)^n