23 Вычислите: rac{12}{35} - rac{18}{25} - rac{11}{28}

1. НОК(35, 25, 28) = 700. 2. rac{12 · 20}{700} - rac{18 · 28}{700} - rac{11 · 25}{700} = rac{240 - 504 - 275}{700} = rac{-539}{700} = rac{-77}{100}