\(0,3=\dfrac{3}{10}\)

Biên độ nhiệt là: \(300-170=130^oC\)

\(2345,76+237,08=2582,84\)

Sáng giờ chưa ăn sáng ăn trưa, đói quá nên ăn luôn rồi :)))

\(\dfrac{7}{9}\div-\dfrac{35}{12}=\dfrac{7}{9}.-\dfrac{12}{35}=-\dfrac{7.3.4}{3.3.5.7}=-\dfrac{4}{15}\)

\(-\dfrac{25}{28}.\dfrac{21}{100}=-\dfrac{5.5.3.7}{4.7.5.5.4}=-\dfrac{3}{16}\)

A

\(\left(\dfrac{9}{4}-2x\right)\left(3x+\dfrac{7}{8}\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}\dfrac{9}{4}-2x=0\\3x+\dfrac{7}{8}=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}-2x=-\dfrac{9}{4}\\3x=-\dfrac{7}{8}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{9}{8}\\x=-\dfrac{7}{24}\end{matrix}\right.\)