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findacounterexampletoshowthateachstatementisfalse1.thesetofoddnumbersisclosed2.theterminatingdecimalsareclosedunderdivision求翻译和解答

题目详情
find a counterexample to show that each statement is false
1.the set of odd numbers is closed
2.the terminating decimals are closed under division
求翻译和解答
▼优质解答
答案和解析
请举出反例证明一下说法是错误的
1.奇数集是封闭的.反例:除法,3/5
2.有限小数在除法下是封闭的.反例:0.1/0.3=0.3333……
封闭的意思是无论加减乘除,结果都属于原来的数集.