化简:2^n-1+2^n-2+.+2^3+2^2+2+1 用(x^n+1-1)为公式回答
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化简:2^n-1+2^n-2+.+2^3+2^2+2+1 用(x^n+1-1)为公式回答
化简:2^n-1+2^n-2+.+2^3+2^2+2+1 用(x^n+1-1)为公式回答
化简:2^n-1+2^n-2+.+2^3+2^2+2+1 用(x^n+1-1)为公式回答
2^n-1+2^n-2+.+2^3+2^2+2+1=2^n-1+2^n-2+.+2^3+2^2+2+1+1-1=2^n-1+2^n-2+.+2^3+2^2+2+2-1=(2^n)-1
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