1+(2/3)(4^ⁿ-4)-(2n-1)*4^ⁿ
=1+2/3*4^ⁿ-2/3*4-(2n-1)*4^ⁿ
=1+2/3*4^ⁿ-2/3*4-(2n-1)*4^ⁿ
=1-8/3+(2/3-(2n-1))4^n
=-5/3+(5/3-2n)4^n
=-(2n-5/3)4ⁿ-5/3
关于数列中的1+(2/3)(4ⁿ-4)-(2n-1)*4ⁿ怎么化简成-(2n-5/3)4ⁿ-5/3
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