1
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1 (it, chi̍t, 一, 壹), sī chi̍t-ê sò͘-jī, sio̍k chū-jiân-sò͘ kap chéng-sò͘, tī 0 āu-piah, tī 2 thâu-chêng.

Sò͘-ha̍k
Tùi līm-hô chi̍t-ê sò͘ x:
- x·1 = 1·x = x
- x/1 = x
- x1 = x,1x = 1
- x↑↑1 = x, 1↑↑x = 1
- līm-hô chi̍t-ê m̄ sī 0 ê sò͘ x, x0=1
"1" ê ián-piàn
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