关于0.9999…=还是≠1一:0.9999…是不等于1的,因为1=0.9999…+(0.1)^n,n无限大,但我们知道,函数y=(0.1)^x的图像是不会与x轴相交的,所以(0.1)^n≠0,所以0.9999…≠1二:记0.9999…=x 有9.9999…=10x
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