If M is a positive integer, then M^3 has how many digits?
(1) M has 3 digits.
(2) M^2 has 5 digits
答案是E,可是我觉得是C,请教大家
100 & 300
100**2=100,000
300**2=900,000
100**3=1,000,000
300**3=27,000,000
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