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未雨绸缪,预作铺垫“按比例分配”就其实质来说,即是将一个数量,按其各部份所占的“份数”来分配的问题。因此,解答按比例分配问题的关键是将题目中的“几:几”转化成份数比的概念。为此,教师在讲授“比”的意义时,就必须有意识的补充如下的一些练习题,为教学“按比例分配”作好垫底工作。 1.看图填空: 甲数:△△△△△乙数:△△△△△△△①甲数和乙数的比是( ):( );②乙数和甲数的比是( ):( );③甲数是乙数的( )/( );④乙数是甲数的( )/( );⑤甲数是甲、乙两数的和的( )/( );⑨乙数是甲、乙两数的和的( )/( )。
Preparing for a rainy day, pre-paving the way for “pro-rata distribution” is, in essence, a question of the allocation of a quantity by its “share” of each component. Therefore, the key to answering the question of proportionate allocation is to convert the concept of “a few: a few” in the title into a fractional ratio. For this reason, when teachers teach the meaning of “比”, they must consciously supplement some of the exercises below to prepare for the “proportional distribution” of teaching. 1. Look at the figure fill in the blank: A number: △ △ △ △ △ B number: △ △ △ △ △ △ △ A and B ratio is () :(); ② B and a number ratio is () (); (); A is the number of B is the number of B () / (); B is the number of B () / (); The number is the sum of A and B () / ().