Question

* -56=34-12
* -910=87-1121
* +89=34+72
* +67=3732 -528

Answer 1

$frac{13}{12} - frac{5}{6} = frac{3}{4} - frac{1}{2} \ frac{1}{4} = frac{1}{4}$

$frac{319}{210} - frac{9}{10} = frac{8}{7} - frac{11}{21} \ frac{13}{21} = frac{13}{21}$

$frac{121}{36} + frac{8}{9} = frac{3}{4} + frac{7}{2} \ frac{17}{4} = frac{17}{4}$

$frac{27}{224} + frac{6}{7} = frac{37}{32} - frac{5}{28} \ frac{219}{224} = frac{219}{224}$