A is a non-zero natural number A、1/a÷3＜1/3÷a B、1/a÷3＝1/3÷a C、1/a÷3＞1/3÷a

B because it can be reduced to 1 / 3A = 1 / 3a

RELATED INFORMATIONS

1. If a is a non-zero natural number, then a ＞ B ＜ C = D should be filled in 0 of a / 18 ＞ A / 25
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