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a)\(\dfrac{-3}{15}+\dfrac{-5}{15}\)
b)\(\dfrac{4}{3}-\dfrac{4}{5}\)
c)\(-1+\dfrac{7}{15}\)
d)\(\dfrac{-1}{15}-\dfrac{7}{15}\)
a: \(\dfrac{-8}{15}=\dfrac{-6}{15}+\dfrac{-2}{15}\)
\(\dfrac{-8}{15}=\dfrac{-3}{15}+\dfrac{-5}{15}\)
\(\dfrac{-8}{15}=\dfrac{-1}{15}+\dfrac{-7}{15}\)
b: \(\dfrac{-8}{15}=\dfrac{16}{15}-\dfrac{24}{15}\)
\(\dfrac{-8}{15}=\dfrac{22}{15}-\dfrac{30}{15}\)
\(\dfrac{-8}{15}=\dfrac{9}{15}-\dfrac{17}{15}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(\dfrac{-8}{15}=\dfrac{-2}{15}+\dfrac{-6}{15}\)
\(\dfrac{-8}{15}=\dfrac{-1}{15}+\dfrac{-7}{15}\)
\(\dfrac{-8}{15}=\dfrac{-4}{15}+\dfrac{-4}{15}\)
b: \(-\dfrac{8}{15}=\dfrac{17}{15}-\dfrac{25}{15}\)
\(\dfrac{-8}{15}=\dfrac{9}{15}-\dfrac{17}{15}\)
\(\dfrac{-8}{15}=\dfrac{10}{15}-\dfrac{18}{15}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1.
$\frac{1}{15}-\frac{9}{15}=\frac{-8}{15}$
$\frac{2}{15}-\frac{10}{15}=\frac{-8}{15}$
$\frac{3}{15}-\frac{11}{15}=\frac{-8}{15}$
Câu 2:
$\frac{-9}{15}+\frac{1}{15}=\frac{-8}{15}$
$\frac{-10}{15}+\frac{2}{15}=\frac{-8}{15}$
$\frac{-11}{15}+\frac{3}{15}=\frac{-8}{15}$
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\({\\{-4} \over 11}\)+\({\\{-5} \over 11}\)=\({\\{-9} \over 11}\)
b)\({\\{10} \over 11}\)-\({\\{19} \over 11}\)=\({\\{-9} \over 11}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(\frac{8}{15}=-\frac{4}{15}-\left(-\frac{12}{15}\right)\)
b, \(\frac{8}{15}=\frac{1}{15}+\frac{7}{15}\)
Bài này có nhiều cách lắm
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{-5}{16}=\frac{-2}{16}+\frac{-3}{16}\)
b) \(\frac{-5}{16}=\frac{4}{16}-\frac{9}{16}\)
\(-\frac{5}{24}-\left(-1\right)\)
\(-\frac{1}{2}-\left(-\frac{31}{24}\right)\)
\(-4-\left(-4\frac{19}{24}\right)\)
Còn nhiều nha mình chỉ kể 1 vài cái cho tham khảo