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1,
\(\frac{25}{12}+\left(\frac{-4}{12}\right)=\frac{7}{4}\)
\(\frac{-10}{8}+\frac{15}{4}=\frac{5}{2}\)
\(\frac{3}{8}+\frac{-14}{6}=\frac{-47}{24}\)
\(\frac{350}{150}+\left(\frac{-200}{360}\right)=\frac{16}{9}\)
\([\frac{5}{8}+\left(\frac{-3}{4}\right)]+\frac{15}{6}=\frac{-1}{8}+\frac{15}{6}=\frac{19}{8}\)
\(\frac{7}{3}+[\left(\frac{-5}{6}\right)+\left(\frac{-2}{3}\right)]=\frac{7}{3}+\left(\frac{-3}{2}\right)=\frac{5}{6}\)
a,\(\left(\dfrac{-2}{3}+\dfrac{3}{7}\right):\dfrac{4}{5}+\left(\dfrac{-1}{3}+\dfrac{4}{7}\right):\dfrac{4}{5}\)
\(=\left(-\dfrac{2}{3}+\dfrac{3}{7}\right).\dfrac{5}{4}+\left(\dfrac{-1}{3}+\dfrac{4}{7}\right).\dfrac{5}{4}\)
\(=\left(\dfrac{-2}{3}+\dfrac{3}{7}+\dfrac{-1}{3}+\dfrac{4}{7}\right).\dfrac{5}{4}\)
\(=\left(-1+1\right).\dfrac{5}{4}=0\)
Chúc bạn học tốt!!!
Câu b làm tương tự!
a) Đoàn Đức Hiếu
b) \(\dfrac{5}{9}:\left(\dfrac{1}{11}-\dfrac{5}{22}\right)+\dfrac{5}{9}:\left(\dfrac{1}{15}-\dfrac{2}{3}\right)\)
\(=\dfrac{5}{9}:\left(-\dfrac{3}{22}\right)+\dfrac{5}{9}:\left(-\dfrac{3}{5}\right)\)
\(=-\dfrac{5}{9}\cdot\dfrac{22}{3}-\dfrac{5}{9}\cdot\dfrac{5}{3}\)
\(=-\dfrac{110}{27}-\dfrac{25}{27}\)
\(=-5\)
\(\frac{1}{5}\div\frac{1}{10}-\frac{1}{3}\cdot\left(\frac{6}{5}-\frac{9}{4}\right)^2=2-\frac{1}{3}\cdot-\frac{21}{20}^2\)
\(=2-\frac{1}{3}\cdot\frac{441}{400}\)
\(=2-\frac{147}{400}=\frac{800}{400}-\frac{147}{400}=\frac{653}{400}\)
Chúc chị/anh học tốt.
\(\frac{1}{5}:\frac{1}{10}-\frac{1}{3}\left(\frac{6}{5}-\frac{9}{4}\right)^2\)
\(=2-\frac{1}{3}\left[\frac{\left(-21\right)}{20}\right]^2\)
\(=2-\frac{1}{3}\cdot\frac{441}{400}\)( số âm. số âm = số dương )
\(=2-\frac{147}{400}\)
\(=\frac{800-147}{400}\)
\(=\frac{653}{400}=1\frac{253}{400}=1,6325\)