进行分数与小数乘除混合运算,当小数与分数的分母同除以一个数使计算简便时,例如,2.8×1(1/4)=0.7×(5/1)=3.5分吗?根据约分的定义,“把一个分数化成同它相等但分子、分母都比较小的分数,叫做约分”。即在一个分数中,用分子、分母的公约数去除分子分母。上式不是在一个分数中用分子、分母的公约数去除分子、分母, For example, 2.8 × 1 (1/4) = 0.7 × (5/1) = 3.5 when the calculation is simple when the denominator of the fraction and the fraction is divided by the same number. The definition of “a score into the same as it but the numerator, the denominator is relatively small fraction, called the appointment.” That is, in a score, the numerator and denominator of the numerator and denominator are used to remove the numerator and denominator. The above formula does not use numerator and denominator common divisor to remove numerator and denominator in one score,