Question

[Thịnh Quang Huy]

Giúp milk b1 nha

Answer 1

[Đại Tiểu Thư]

\(1,\dfrac{8}{13}+\dfrac{5}{13}=\dfrac{8+5}{13}=\dfrac{13}{13}=1\)

\(2,\dfrac{-8}{7}+\dfrac{-6}{7}=\dfrac{\left(-8\right)+\left(-6\right)}{7}=\dfrac{-14}{7}=-2\)

\(5,\dfrac{7}{-9}-\dfrac{13}{9}=\dfrac{\left(-7\right)-13}{9}=\dfrac{-20}{9}\)

\(6,\dfrac{5}{7}-\dfrac{-3}{21}=\dfrac{15}{21}-\dfrac{-3}{21}=\dfrac{15-\left(-3\right)}{21}=\dfrac{18}{21}=\dfrac{6}{7}\)

\(9,\dfrac{7}{-10}-\dfrac{2}{-15}=\dfrac{-105}{150}-\dfrac{-20}{150}=\dfrac{-\left(105-20\right)}{150}=\dfrac{-85}{150}\)

\(10,\dfrac{6}{13}-\dfrac{-15}{39}=\dfrac{18}{39}-\dfrac{-15}{39}=\dfrac{18-\left(-15\right)}{39}=\dfrac{33}{39}=\dfrac{11}{13}\)

Answer 2

[★彡✿ทợท彡★]

1)  \(\dfrac{8}{13}+\dfrac{5}{13}=\dfrac{13}{13}=1\)

2 ) \(\dfrac{-8}{7}+\dfrac{-6}{7}=\dfrac{-14}{7}=-2\)

3 ) \(\dfrac{-4}{3}-\dfrac{-7}{3}\)\(=\dfrac{3}{3}=1\)

4 ) \(\dfrac{-8}{5}+\dfrac{6}{-5}=\dfrac{-8}{5}+\dfrac{-6}{5}\)\(=\dfrac{-14}{5}\)

5 ) \(\dfrac{7}{-9}-\dfrac{13}{9}=\dfrac{-7}{9}-\dfrac{13}{9}=\dfrac{-20}{9}\)

6 ) \(\dfrac{5}{7}-\dfrac{-3}{21}=\dfrac{5\times3}{7\times3}=\dfrac{15}{21}-\dfrac{-3}{21}=\dfrac{18}{21}\)\(=\dfrac{6}{7}\)

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