Dấu không rõ mik chia ra làm nhân và chia
TH1: chia
$2\dfrac{1}{3}+\dfrac{3}{4}:\dfrac{4}{7}-0,75$
$=\dfrac{7}{3}+\dfrac{3}{4}.\dfrac{7}{4}-\dfrac{3}{4}$
$=\dfrac{7}{3}+\dfrac{21}{16}-\dfrac{3}{4}$
$=\dfrac{112}{48}+\dfrac{63}{48}-\dfrac{36}{48}$
$=\dfrac{112+63-36}{48}=\dfrac{139}{48}$
TH2: nhân
$2\dfrac{1}{3}+\dfrac{3}{4}.\dfrac{4}{7}-0,75$
$=\dfrac{7}{3}+\dfrac{3}{7}-\dfrac{3}{4}$
$=\dfrac{196}{84}+\dfrac{36}{84}-\dfrac{63}{84}$
$=\dfrac{196+36-63}{84}=\dfrac{169}{84}$
