Question

thực hiện phép tính (tính nhanh nếu có thể)

Answer 1

Lời giải:
e.

$=(\frac{-2}{11}+\frac{-9}{11})+(\frac{6}{7}+\frac{1}{7})+\frac{1}{2}$

$=\frac{-11}{11}+\frac{7}{7}+\frac{1}{2}$

$=(-1)+1+\frac{1}{2}=\frac{1}{2}$

f.

$=(\frac{8}{19}+\frac{-27}{19})+(\frac{4}{21}+\frac{17}{21})+\frac{2}{5}$

$=\frac{-19}{19}+\frac{21}{21}+\frac{2}{5}$

$=(-1)+1+\frac{2}{5}=\frac{2}{5}$

g.

$=\frac{(-2)+(-8)+17}{15}=\frac{7}{15}$

h.

$=\frac{-10}{30}+\frac{12}{30}+\frac{-75}{30}$

$=\frac{(-10)+12+(-75)}{30}=\frac{-73}{30}$