0.9(9是循环小数)小于还是等于1
老师给我们讲了一道题:0.9(循环)等于1,但我爸说0.9(循环)等于1,我应该相信谁?也请各位知道答案的网友告诉我.谢谢!
人气:180 ℃ 时间:2019-12-26 06:36:16
解答
0.9(循环)=1
证明:设0.9(循环)=X,则9.9(循环)=10X
所以9=10X-X=9X
即 X=1,因此0.9(循环)=1
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