Question

13．3個(gè)一和2個(gè)$\frac{1}{5}$組成的數(shù)是3$\frac{2}{5}$，再添上3個(gè)$\frac{1}{5}$就是4．

Answer 1

分析 3個(gè)一是3，2個(gè)$\frac{1}{5}$是$\frac{2}{5}$，3+$\frac{2}{5}=3\frac{2}{5}$，再用4減去3$\frac{2}{5}$，根據(jù)分子數(shù)量進(jìn)行填空即可．

解答 解：3×1+$\frac{1}{5}+$$\frac{1}{5}$
=3+$\frac{2}{5}$
=3$\frac{2}{5}$
4-3$\frac{2}{5}$=$\frac{3}{5}$
$\frac{3}{5}$是3個(gè)$\frac{1}{5}$．
答：3個(gè)一和2個(gè)$\frac{1}{5}$組成的數(shù)是3$\frac{2}{5}$，再添上3個(gè)$\frac{1}{5}$就是4．
故答案為：3$\frac{2}{5}$；3．

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