Answer:

[tex]1.) \: \frac{7}{10}+\frac{2}{5}= \frac{9}{15} \\ 2.) \: \frac{7}{4} - \frac{8}{5} = 1 \\ 3.) \: \frac{1}{2} \times \frac{5}{4} = \frac{5}{8} [/tex]

Step-by-step explanation:

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