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4/9.8/15+4/19.7/15-4/9
=4/9.(8/15+7/15)-4/9
=4/9.1-4/9
=4/9-4/9
=0
\(-\dfrac{2}{9}+\dfrac{8}{15}+\dfrac{5}{3}-\dfrac{7}{9}+\dfrac{7}{15}\)
\(=-\dfrac{2}{9}-\dfrac{7}{9}+\dfrac{8}{15}+\dfrac{7}{15}+\dfrac{5}{3}\)
\(=-\dfrac{9}{9}+\dfrac{15}{15}+\dfrac{5}{3}\)
\(=-1+1+\dfrac{5}{3}\)
\(=0+\dfrac{5}{3}\)
\(=\dfrac{5}{3}\)
-2/9 + 8/15 + 5/3 - 7/9 + 7/15
= -2/9 - 7/9 + 8/15 + 7/15 + 5/3
= -9/9 + 15/15 + 5/3
= -1 + 1 + 5/3
= 0 + 5/3
=5/3
câu a :
\(\dfrac{-8}{24}+\dfrac{-4}{12}=\dfrac{-1}{3}+\dfrac{-1}{3}=\dfrac{-2}{3}\)
câu b :
\(\dfrac{-20}{35}+\dfrac{16}{24}=\dfrac{-4}{7}+\dfrac{2}{3}=\dfrac{2}{21}\)
câu c :
\(\dfrac{-3}{9}+\dfrac{-6}{15}=\dfrac{-1}{3}+\dfrac{-2}{5}=\dfrac{-11}{15}\)
câu d :
\(\dfrac{3}{13}-\dfrac{4}{10}=\dfrac{3}{13}-\dfrac{2}{5}=\dfrac{-11}{65}\)
câu e :
\(\dfrac{5}{17}-\dfrac{9}{15}=\dfrac{5}{17}-\dfrac{3}{5}=\dfrac{-26}{85}\)
câu g :
\(\dfrac{9}{18}-\dfrac{6}{15}+\dfrac{3}{-9}=\dfrac{9}{18}-\dfrac{6}{15}+\dfrac{-3}{9}\\ =\dfrac{1}{2}-\dfrac{2}{5}+\dfrac{-1}{3}=\dfrac{-7}{30}\)
câu h :
\(\dfrac{5}{4}-\dfrac{1}{2}+\dfrac{-7}{8}=\dfrac{10}{8}-\dfrac{4}{8}+\dfrac{-7}{8}=\dfrac{-1}{8}\)
\(=\frac{-5}{9}+\frac{8}{15}+-\frac{2}{11}+\frac{4}{-9}+\frac{7}{15}\)
\(=\left(-\frac{5}{9}-\frac{4}{9}\right)+\left(\frac{8}{15}+\frac{7}{15}\right)+-\frac{2}{11}\)
\(=-1+1+-\frac{2}{11}\)
\(=-\frac{2}{11}\)
-24 nha
(-9) - 15 = - 24
Mọi người đừng ngại ngần j tk mik đi!