Đáp án:
Giải thích các bước giải:
a, $\frac{5}{-8}$ + $\frac{14}{25}$
= $\frac{-125}{200}$ + $\frac{112}{200}$
= $\frac{-13}{200}$
b, $\frac{-5}{6}$ + $\frac{12}{15}$
= $\frac{-25}{30}$ + $\frac{24}{30}$
= $\frac{-1}{30}$
c, $\frac{-7}{8}$ + $\frac{9}{6}$
= $\frac{-7}{8}$ + $\frac{3}{2}$
= $\frac{-7}{8}$ + $\frac{12}{8}$
= $\frac{5}{8}$
d, $\frac{-12}{15}$ + $\frac{4}{-9}$
= $\frac{-36}{45}$ + $\frac{-20}{45}$
= $\frac{-56}{45}$
