设M=2[1+3+.+3^(2n-1)]
3M=2[3+9+.+3^2n]
3M-M=2[3M=2[3+9+.+3^(2n-1)+3^2n-1-3-.-3^(2n-1)]
2 M=2（3^2n-1)
M=3^2n-1
设M=2[1+3+.+3^(2n-1)] 3M=2[3+9+.+3^2n] 3M-M=2（3^2n-1) M=3^2n-
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