利用扩分法解一类分数应用题的条件和方法之一是:已知总体的和,利用已知各分数所包含的值的等量关系,把各分数扩大为相同分子的分数,使这些分数的每个分数单位所包含的值也成等量关系。这样,就把总体平均分成了各分数分母的和的等份数,然后再取其中的一份或几份而得出答案。 One of the conditions and methods for solving a class of fractional application problems by using the expanded-point method is that the sum of the known totals is expanded by using the equal relation of the values ​​contained in each known fraction to make the fractions of the same numerator, Each fraction of a fraction contains the same value. In this way, the overall average is divided into equal parts of the fractions of the denominator and then take one or more of them to come to the answer.