Rounding Quiz (Significant Figures) 有效數字:測驗
輸入正確答案後(不可包含空格)按「核對」。答對得1分,答錯不扣分。
Press “Check” after entering answers (spaces are not allowed). One mark is scored for each correct answer. No marks are deducted for wrong answers.
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http://www.gmath.hk