Question

26+(-83);-43+53;-4.254+6.44;-6.7+5.9; 5/12+(-7/9);-11//42+5/28;-5/7+1;2,9/40+2,4/15

Answer 1

-57; 10; 2.186; -0.8;

-13/36; -1/12; 2/7; 0,385 

Answer 2

$26+(-83)=26-83=-57$

$-43+53=10$

$-4.254+6.44=2,186$

$-6.7+5.9=-0,8$

$frac{5}{12}+(-frac{7}{9})=frac{5}{12}-frac{7}{9}=frac{15}{36}-frac{28}{36}=-frac{13}{36}$

$-frac{11}{42}+frac{5}{28}=-frac{22}{84}+frac{15}{84}=-frac{7}{84}=-frac{1}{12}$

$-frac{5}{7}+1=-frac{5}{7}+frac{7}{7}=frac{2}{7}$

$frac{2,9}{40}+frac{2,4}{15}=frac{8,7}{120}+frac{19,2}{120}=frac{27,9}{120}=0,2325$