2的n次方+2的n次方-3×2的n+1次方等于几?

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2的n次方+2的n次方-3×2的n+1次方等于几?
2的n次方+2的n次方-3×2的n+1次方等于几?

2的n次方+2的n次方-3×2的n+1次方等于几?
2^n+2^n-3×2^(n+1)
=2×2^n-3×2^(n+1)
=2^n-3×2^(n+1)
=-2×2^(n+1)
=-2^(n+2)