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判断时运用除法与分数的关系,先将除法算式转化为分数(不是最简分数的要化成最简分数),然后把最简分数的分母分解为质因数连乘的形式,根据分数分母的质因数的不同,按以下的方法判断: 1.一个最简分数的分母中,如不含有2和5以外的质因数时,这个分数可以化成有限小数,且其商的小数位数就是分母的质因数中含有2或5的最多个数。例如,1÷2=1/2,分母中只含有1个2,其商是一位有限小数,5÷8=5/8,分母的质
When judging the relationship between the division and the score, the dividing formula is first converted to a score (not the simplest fraction to be converted into the simplest fraction), and then the simplest fraction of the denominator is decomposed into prime factors multiplied by the form, according to the quality of the fractional denominator The difference between the factors is determined as follows: 1. In the denominator of a simplest fraction, if there are no prime factors other than 2 and 5, this fraction can be converted into a finite fraction and the quotient of its quotient is the denominator The factor contains the maximum number of 2 or 5. For example, 1 ÷ 2 = 1/2, denominator contains only 1 2, the quotient is a finite decimal, 5 ÷ 8 = 5/8, the denominator of the quality