【用戶】LAI
【年級】小二上
【評論內容】黑0棕1紅2橙3黃4綠5藍6紫7灰8白9棕黑紅銀 = 10 * 102 ±x紅黑紅銀 = 20 * 102 ±x1000 + 2000 ≒ 3000 =3k (Ω)