6 phần 7 - 9 phần 14 ; 9 phần 8 : 3 phần 4
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\(\frac{6}{9}+\frac{5}{7}+\frac{1}{3}+\frac{4}{14}\)
\(=\left(\frac{6}{9}+\frac{1}{3}\right)+\left(\frac{5}{7}+\frac{4}{14}\right)\)
\(=1+1\)
\(=2\)
\(\left(25\frac{4}{9}-14\frac{6}{13}\right)-\left(24\frac{7}{13}-15\frac{5}{9}\right)\)
\(=\left(24\frac{7}{13}-14\frac{6}{13}\right)-\left(25\frac{4}{9}-15\frac{5}{9}\right)\)
\(=\frac{131}{13}-\frac{89}{9}\)
\(=\frac{22}{117}\)
a) \(\dfrac{4}{7}và\dfrac{5}{6}\)⇔ \(\dfrac{24}{42}và\dfrac{35}{42}\)
b) \(\dfrac{5}{14}và\dfrac{3}{8}\)⇔ \(\dfrac{20}{56}và\dfrac{21}{56}\)
c) \(\dfrac{9}{10}và\dfrac{7}{5}\)⇔ \(\dfrac{9}{10}và\dfrac{14}{10}\)
d) \(\dfrac{3}{5};\dfrac{5}{6}và\dfrac{7}{30}\)⇔ \(\dfrac{18}{30};\dfrac{25}{30}và\dfrac{7}{30}\)
a)\(\frac{9}{6}+\frac{7}{24}=\frac{36}{24}+\frac{7}{24}=\frac{36+7}{24}=\frac{43}{24}\)
b)\(\frac{-5}{7}+\frac{8}{14}=\frac{-10}{14}+\frac{8}{14}=\frac{-10+18}{14}=\frac{8}{14}\)\(=\)\(\frac{4}{7}\)
c)\(\frac{-7}{6}+\left(-2\right)=\frac{-7}{6}+\frac{-2}{1}=\frac{-7}{6}+\frac{-12}{6}=\frac{-7+\left(-12\right)}{6}=\frac{-19}{6}\)
d)\(\frac{-50}{300}+\frac{-40}{200}=\frac{-10000}{60000}+\frac{-12000}{60000}=\frac{-10000+\left(-12000\right)}{60000}=\frac{-22000}{60000}\)
6/7-9/14
=12/14-9/14
=3/14
9/8:3/4
=9/8.4/3
=3/2
\(\dfrac{6}{7}-\dfrac{9}{14}=\dfrac{12}{14}-\dfrac{9}{14}=\dfrac{3}{14}\)
\(\dfrac{9}{8}:\dfrac{3}{4}=\dfrac{9}{8}\times\dfrac{4}{3}=\dfrac{3}{2}\)