1.
C
3*5*7*7*7*7*7-1=5*9*9*7-1=5*7-1=4(均为各位数字）
2.
D
(3+1)=0.5(3^2-1)=0.5(3+1)(3-1)
=0.5（3-1)（3+1)*(3^2+1)*(3^4+1)*(3^8+1)
=0.5(3^2-1)*(3^2+1)*(3^4+1)*(3^8+1)
=0.5(3^4-1)(3^4+1)(3^8+1)
=0.5(3^16-1)
(1)已知m=(2+1)*(2^2+1)*(2^4+1)*(2^8+1)*(2^16+1)*(2^32+1)*(2^64
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