Question

 3m-3d 3m-2d
-------- -- ---------                   Упростите выражение
2m-2d m-3d 

Answer 1

$frac{3m - 3d}{2m-2d} - (- frac{3m-2d}{m-3d} ) = frac{3(m-d)}{2(m-d)} + frac{3m-2d}{m-3d} = frac{3}{2} +frac{3m-2d}{m-3d} = \ \ = frac{3(m-3d)+2(3m-2d)}{2(m-3d)} = frac{3m-9d+6m-4d}{2(m-3d)} = frac{9m-13d}{2m-6d}$
Если  "--"  опечатка и выражение следует читать так:
$frac{3m - 3d}{2m-2d} - frac{3m-2d}{m-3d} = frac{3(m-d)}{2(m-d)} - frac{3m-2d}{m-3d}= frac{3}{2} -frac{3m-2d}{m-3d}= \ \ = frac{3*(m-3d) -2(3m-2d)}{2(m-3d)}= frac{3m-9d-6m+4d}{2(m-3d)} = frac{5d-3m}{2m-6d}$