Đáp án:
Giải thích các bước giải:
\[\begin{array}{l}
a)\frac{9}{{25}} = \frac{{9 \times 4}}{{25 \times 4}} = \frac{{36}}{{100}} = 0,36\\
b)2\frac{3}{8} = 2\frac{{3 \times 125}}{{8 \times 125}} = 2\frac{{375}}{{1000}} = 2,375\\
5\frac{7}{{25}} = 5\frac{{7 \times 4}}{{25 \times 4}} = 5\frac{{28}}{{100}} = 5,28\\
c)\frac{7}{5} = \frac{{7 \times 20}}{{5 \times 20}} = \frac{{140}}{{100}} = 1,40\\
\frac{{13}}{4} = \frac{{13 \times 25}}{{4 \times 25}} = \frac{{325}}{{100}} = 3,25\\
d)2,15 = \frac{{215}}{{100}} = \frac{{215:5}}{{100:5}} = \frac{{43}}{{20}}\\
4,36 = \frac{{436}}{{100}} = \frac{{436:4}}{{100:4}} = \frac{{109}}{{25}}\\
0,8 = \frac{8}{{10}} = \frac{4}{5}
\end{array}\]
