(-2)的n次方*(-2)的n+1次方*2的n+2次方=

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(-2)的n次方*(-2)的n+1次方*2的n+2次方=

(-2)的n次方*(-2)的n+1次方*2的n+2次方=
(-2)的n次方*(-2)的n+1次方*2的n+2次方=

(-2)的n次方*(-2)的n+1次方*2的n+2次方=
(-2)n次方x(-2)的n+1次方x2的n+2次方=(-2)^(n+n+1)x2^(n+2)=(-2)^(2n+1)x2^(n+2)=(-2)^(2n+1+n+2)=(-2)^(3n+3)