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並前往https://docs.racket-lang.org/reference/number-types.html

4.3.1 Number Types - Racket Documentation

+inf.0). #t. > (real? 2+3i). #f. > (real? 2.0+0.0i). #f. > (real? "hello") ... (exact-positive-integer? 1). #t. > (exact-positive-integer? 0).

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