求2^n+2^n-2^(2n+1)的值

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求2^n+2^n-2^(2n+1)的值求2^n+2^n-2^(2n+1)的值求2^n+2^n-2^(2n+1)的值2^n+2^n-2^(2n+1)=2^n*(1+1)-2^(2n+1)=2*2^n+2

求2^n+2^n-2^(2n+1)的值
求2^n+2^n-2^(2n+1)的值

求2^n+2^n-2^(2n+1)的值
2^n+2^n-2^(2n+1)
=2^n*(1+1)-2^(2n+1)
=2*2^n+2^(2n+1)
=2^(n+1)+2^(n+1)*2^n
=2^(n+1)(1+2^n)

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