Rút gọn phân số \(\frac{{240}}{{320}}\) được phân số tối giản là:

a) \(\frac{3}{8} \times \frac{{19}}{{12}} + \frac{3}{8} \times \frac{5}{{12}}\)

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b) \(\frac{4}{7} \times \frac{{17}}{{13}} - \frac{4}{7} \times \frac{4}{{13}}\)

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a) \(\frac{5}{8} + \frac{{13}}{{24}}\)

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b) \(\frac{5}{3} \times \frac{3}{7}\)

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c) \(\frac{8}{9} - \frac{{14}}{{18}}\)

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d) \(\frac{5}{{12}}:\frac{5}{4}\)

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