一道GRE数学题,谁帮我看看阿?d=5.03894 and c is the decimal expression for d rounded to the nearest thousandth.the number of decimal places where d and c differ 4 the number of the decimal places where d and c differ 说c 精确到千分位

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一道GRE数学题,谁帮我看看阿?
d=5.03894 and c is the decimal expression for d rounded to the nearest thousandth.
the number of decimal places where d and c differ 4
the number of the decimal places where d and c differ 说c 精确到千分位是5.039 不太理解,

d=5.03894,c是d四舍五入到千分位的数.
在哪个小数位数上d和c之间相差4?
答案应该是:
five(第五个小数位)