(-3)的2N+1次方+3(-3)的2N次方=

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(-3)的2N+1次方+3(-3)的2N次方=
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(-3)的2N+1次方+3(-3)的2N次方=
(-3)的2N+1次方+3(-3)的2N次方=

(-3)的2N+1次方+3(-3)的2N次方=
(-3)的2N+1次方+3(-3)的2N次方
=-3^(2n+1) + 3*3^(2n)
=-3^(2n+1)+3^(2n+1)=0