Giải thích các bước giải:
$a,$ $\frac{15}{12}$ + $\frac{5}{13 }$ - $\frac{3}{12}$ - $\frac{18}{13}$ $=$ ($\frac{15}{12}$ - $\frac{3}{12}$) + ($\frac{5}{13}$ - $\frac{18}{13}$) $= 1 + (-1)$ $=0$
$b,$ $\frac{13}{25}$ + $\frac{6}{41}$ - $\frac{38}{25}$ + $\frac{35}{41}$ - $\frac{1}{2}$ $=$ ($\frac{13}{25}$ - $\frac{38}{25}$) + ($\frac{6}{41}$ + $\frac{35}{41}$) - $\frac{1}{2}$ $= (-1)+ 1-$ $\frac{1}{2}$ $=$ $\frac{-1}{2}$
$c, $$\frac{16}{41}$ + $\frac{15}{23}$ - $\frac{3}{2}$ + $\frac{25}{41}$ - $\frac{38}{23}$ $=$ ($\frac{16}{41}$ + $\frac{25}{41}$) + ($\frac{15}{23}$ - $\frac{38}{23}$) - $\frac{3}{2}$ $= 1 + (-1) $ - $\frac{3}{2}$ $=$ $\frac{-3}{2}$
$d,15.$$\frac{-2}{3²}$ + $\frac{11}{3}$ $= 15.$$\frac{-2}{9}$ + $\frac{11}{3}$ $=$ $\frac{-10}{3}$ + $\frac{11}{3}$ $=$ $\frac{1}{3}$
