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数学中的某些名词、术语,不止一种含义。对此,我们在应用、理解时,要注意其具体语言环境和表述形式,使其具有确定的意义。下面试举一例。先看下面三个题目。①甲数是50,乙数比它多1/5,乙数是多少? ②甲数是50,乙数比它多20％,乙数是多少? ③甲体重50千克,乙比他多1/5千克,乙体重是多少? 由于分数在计数意义上有双重性,可以表示具体的量,也可以表示两个数量间的倍数关系。①题中,如把1/5看作具体量,那么这里1/5把自然数1当作单位“1”,乙数是50+1/5=50 1/5。如把1/5这个分
Some nouns in mathematics, terminology, more than one meaning. In this regard, we in the application, understanding, we must pay attention to its specific language environment and the form of expression, so that it has a definite meaning. Cite an example below. Look at the following three questions. ① A number is 50, B more than 1/5, B is the number of? ② A number is 50, B more than it 20%, B is the number of? ③ A body weight of 50 kg, B more than him / 5 kg, what is the weight of B? As the score in the count of duality, can be expressed as a specific amount, it can also be expressed as a multiple between the two numbers. ① questions, such as 1/5 as a specific amount, then 1/5 of the natural number 1 as a unit “1”, B is 50 + 1/5 = 50 1/5. If the 1/5 this point