(2 1/4 - 1 2/3) : 5/6  

(2 1/4 - 1 2/3) : 5/6 = (9/4 - 5/3) / 5/6 = (27/12 - 20/12) * 6/5 = 7/12 * 6/5 = 7/10 = 0,7

(2 1/4 - 1 2/3) : 5/6 = = 7/12 * 6/5 = = 7/10

(2 1/4 - 1 2/3) : 5/6 = (9/4 - 5/3) : 5/6 = (27/12 - 20/12) : 5/6 = 7/12 *6/5 = = 42/60 po skróceniu 7/10