Đúng ghi Đ, sai ghi S :
a) \(\dfrac{4}{5}\) - \(\dfrac{3}{10}\) - \(\dfrac{7}{20}\) = \(\dfrac{3}{20}\) ...... b) \(\dfrac{2}{5}\) x \(\dfrac{1}{3}\) x \(\dfrac{3}{8}\) < \(\dfrac{5}{120}\) ......
c) \(\dfrac{7}{5}\) : \(\dfrac{14}{15}\) x \(\dfrac{2}{3}\) = 1 ...... d) \(\dfrac{9}{4}\) - \(\dfrac{3}{4}\) x \(\dfrac{1}{5}\) = \(\dfrac{3}{10}\) ......
\(a,Đ\\ b,-S\\=\dfrac{2\times1\times3}{5\times3\times8}=\dfrac{1}{20}>\dfrac{5}{120}\\ c,Đ\\ d,S\\ =\dfrac{9}{4}-\dfrac{3}{20}=\dfrac{9\times5-3}{20}=\dfrac{21}{10}\)
Đúng 3
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