325=2()5=3\dfrac{2}{5}=2\dfrac{(\quad)}{5}= ___ ÷÷ ___ .

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Worked solution

1. 将带分数 $3\dfrac{2}{5}$ 转化为整数部分为 $2$ 的分数形式,求出括号中的数

325=3+25=2+1+25=2+55+25=2753\dfrac{2}{5} = 3 + \dfrac{2}{5} = 2 + 1 + \dfrac{2}{5} = 2 + \dfrac{5}{5} + \dfrac{2}{5} = 2\dfrac{7}{5}
因此,括号内应填入 77.

2. 将带分数转化为假分数,再根据分数与除法的关系写成除法算式

325=3×5+25=1753\dfrac{2}{5} = \dfrac{3 \times 5 + 2}{5} = \dfrac{17}{5}
根据分数与除法的关系(分子相当于被除数,分母相当于除数,分数线相当于除号),可得:
175=17÷5\dfrac{17}{5} = 17 \div 5
因此,后两个空格依次填入 1717 和 55.

Answer

7;17;5

AI analysis — may contain mistakes.

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