terminating decimal

belle98 · 发表于 2012-1-11 20:26:45

N是正整数，N/225是terminating decimal

*1, N dividable by 3

*2, N dividable by 5

我也不太明白啥叫terminating decimal（是否解作无限不循环小数？）, 觉得可能是可以除尽，不会有循环小数吧，225是9的倍数，所以两个都不行，选了E
是否正确，請指导

宣小妞妞妞 · 发表于 2012-1-11 20:28:57

这道题我今天考了！！！

terminating decimal是有限小数。。

misterbloom · 发表于 2012-1-15 22:15:40

terminating decimal 就是有限小数的意思，请记住能被N个2或N个5除的都是terminating decimal

cherryin · 发表于 2012-1-15 23:45:12

那我理解这题选B

Gmatliu · 发表于 2012-1-16 09:56:06

我觉得是E。因为225分解有两个5，两个3. 必须被两个3整除N/225才能是terminating decimal
Terminating and Repeating Decimals

Any rational number (that is, a fraction in lowest terms) can be written as either a terminating decimal or a repeating decimal. Just divide the numerator by the denominator. If you end up with a remainder of 0, then you have a terminating decimal. Otherwise, the remainders will begin to repeat after some point, and you have a repeating decimal.

Example:

Convert the fraction 5/8 to a decimal.

The division is as follows:

So, 5/8 = 0.625. This is a terminating decimal.

Example:

Convert the fraction 7/12 to a decimal.

The division is as follows:

So:

This is a repeating decimal.

The bar over the number, in this case 3, indicates the number or block of numbers that repeat unendingly

terminating decimal

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