Đáp án:

↓↓↓↓↓↓↓↓↓↓ . xin hay nhất ạ .

Giải thích các bước giải:

a)$\frac{3}{5}$ - $\frac{-7}{10}$ - $\frac{-13}{-20}$

= $\frac{12}{20}$ - $\frac{-14}{20}$ - $\frac{13}{20}$

= $\frac{-2}{20}$ - $\frac{13}{20}$

= $\frac{-15}{20}$

= $\frac{-3}{4}$

b) $\frac{3}{4}$ + $\frac{-1}{3}$ - $\frac{5}{18}$

= $\frac{9}{12}$ + $\frac{-4}{12}$ - $\frac{5}{18}$

= $\frac{5}{12}$ - $\frac{5}{18}$

= $\frac{15}{36}$ - $\frac{10}{36}$

= $\frac{5}{36}$

c) $\frac{3}{14}$ - $\frac{-5}{-8}$ + $\frac{-1}{2}$

= $\frac{12}{56}$ - $\frac{5}{8}$ + $\frac{-28}{56}$

= $\frac{12}{56}$ - $\frac{35}{56}$ + $\frac{-28}{56}$

= $\frac{-23}{56}$ + $\frac{-28}{56}$

= $\frac{-51}{56}$

d) $\frac{1}{2}$ + $\frac{1}{-3}$ + $\frac{1}{4}$ + $\frac{-1}{6}$

= $\frac{6}{12}$ + $\frac{-1}{3}$ + $\frac{3}{12}$ + $\frac{-2}{12}$

= $\frac{6}{12}$ + $\frac{-4}{12}$ + $\frac{1}{12}$

= $\frac{2}{12}$ +$\frac{1}{12}$ 

= $\frac{3}{12}$

= $\frac{1}{4}$

e) $\frac{2}{9}$ + $\frac{5}{-12}$ - $\frac{-3}{4}$ 

= $\frac{8}{36}$ + $\frac{-5}{12}$ - $\frac{-27}{36}$

= $\frac{8}{36}$ + $\frac{-15}{36}$ - $\frac{-27}{36}$

= $\frac{-7}{36}$ - $\frac{-27}{36}$

= $\frac{20}{36}$

= $\frac{5}{9}$

f) $\frac{-6}{7}$ + (-4) + $\frac{-4}{5}$

= $\frac{30}{35}$ + $\frac{-140}{35}$ + $\frac{-28}{35}$

= $\frac{-110}{35}$ + $\frac{-28}{35}$

= $\frac{138}{35}$

g) ( $\frac{-2}{7}$ + $\frac{4}{-3}$ ) - ( $\frac{-2}{7}$ - $\frac{14}{5}$ ) - $\frac{7}{3}$

= ( $\frac{-6}{21}$ + $\frac{-28}{21}$ ) - ( $\frac{-10}{35}$ - $\frac{98}{35}$ ) - $\frac{7}{3}$

= $\frac{-34}{21}$ - $\frac{-108}{35}$ - $\frac{7}{3}$

= $\frac{-170}{105}$ - $\frac{-324}{105}$ - $\frac{245}{105}$

= $\frac{154}{105}$ - $\frac{245}{105}$

= $\frac{91}{105}$

h) $\frac{-4}{12}$ + $\frac{6}{7}$ + $\frac{8}{24}$

= $\frac{-1}{3}$ + $\frac{6}{7}$ +$\frac{1}{3}$ 

= $\frac{-7}{21}$ + $\frac{18}{21}$ + $\frac{7}{21}$

= $\frac{0}{21}$ +$\frac{18}{21}$ 

= $\frac{18}{21}$

= $\frac{6}{7}$ 

i) $\frac{9}{18}$ - $\frac{-7}{12}$ + $\frac{13}{32}$ 

= $\frac{18}{36}$ - $\frac{-21}{36}$ + $\frac{13}{32}$ 

= $\frac{39}{36}$ + $\frac{13}{32}$

= $\frac{39}{12}$ + $\frac{13}{32}$

= $\frac{3456}{384}$ + $\frac{4992}{284}$

= $\frac{1536}{384}$

= 4

k) $\frac{11}{26}$ + $\frac{32}{39}$ - $\frac{-14}{52}$

= $\frac{858}{2018}$ + $\frac{1664}{2018}$ - $\frac{-546}{2018}$

= $\frac{2191}{2018}$ - $\frac{-546}{2018}$

= $\frac{2738}{2018}$

= $\frac{1369}{1009}$

l) $\frac{-5}{13}$ - ( $\frac{5}{3}$ + $\frac{3}{13}$ - $\frac{4}{10}$ )

= $\frac{-5}{13}$ - ( $\frac{5}{3}$ + $\frac{30}{130}$ -$\frac{52}{130}$ )

= $\frac{-5}{13}$ - ( $\frac{5}{3}$ + $\frac{-12}{130}$ )

= $\frac{-50}{130}$ - $\frac{5}{3}$ + $\frac{-5}{130}$ - $\frac{-12}{130}$

= $\frac{-50}{130}$ - $\frac{5}{3}$ + $\frac{7}{130}$

= $\frac{-43}{130}$ - $\frac{5}{3}$

=$\frac{-779}{390}$