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小朋友,你一定知道“比例的基本性质”吧:在比例里,两个外项的积等手两个内项的积。那么,反过来,如果有两个教的积等于另外两个数的积,那么这四个数就可以组成比例。同时,逆用比例的基本性质,可以帮助你找到一些解答稍复杂的分数乘除法问题的方法。
Children, you must know “the basic nature of the ratio ”: In the ratio, the product of the two outer terms equals the product of the two inner terms. So, conversely, if there are two taught products equal to the product of the other two numbers, then these four numbers can form a ratio. At the same time, the basic nature of the inverse ratio can help you find some solutions to the somewhat complicated problem of fractional multiplication and division.