Question

Bài 1:

a)9\(\dfrac{4}{5}\)-(2\(\dfrac{2}{3}\)+6\(\dfrac{4}{5}\))

b)75%-1\(\dfrac{3}{10}\)+0,5:\(\dfrac{5}{8}\)

Answer 1

a/ \(\dfrac{49}{5}-\left(\dfrac{8}{3}+\dfrac{34}{5}\right)\)=\(\dfrac{49}{5}-\left(\dfrac{40}{15}+\dfrac{102}{15}\right)=\dfrac{49}{5}-\dfrac{142}{15}\)

=\(\dfrac{147}{15}-\dfrac{142}{15}=\dfrac{1}{3}\)

b/\(\dfrac{3}{4}-\dfrac{13}{10}+\dfrac{1}{2}:\dfrac{5}{8}\)=\(\dfrac{3}{4}-\dfrac{13}{10}+\dfrac{1}{2}.\dfrac{8}{5}\)

=\(\dfrac{3}{4}-\dfrac{13}{10}+\dfrac{4}{5}\)

=\(\dfrac{15}{20}-\dfrac{26}{20}+\dfrac{16}{20}\)

=\(\dfrac{1}{4}\)

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