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三位數除以一位數（一）
【案例】2018年全国1卷理科12题
判斷球體
找出對稱軸
兩組對邊相等的四邊形
Membuka sumber
任務2
邊長與三角形 數學教室(1/4)
Rounding Quiz (Significant Figures) 有效數字：測驗
增加數據對平均數的影響
Sunrays with different angles