Gēng-Huák
Gēng-huák(減法) sê gă-huák gì nĭk-ông-sáung, téng nguòng-lài gì siŏh cū diē-sié dò̤ kó̤ siŏh buô-hông, sáung diông giâ lì gì buô-hông.
Gēng-huák gì hù-hô̤ sê „-“, giék-guō hô̤ lā̤ „chă“.
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