1)12.2/3-63.1/3:5.2/11 черта дроби 2 2/32) (7 14/45 :7 - 39/40)*7,23)0,8 черта

Решим образцы. 

1) (12 2/3 - 63 1/3 : 5 2/11)/(2 2/32) = (38/3 - 190/3 : 57/11)/(2 1/16) = (38/3 - 190/3 * 11/57)/(33/16) = (38/3 - 2090/171)/(33/16) = (2166/171 - 2090/171)/(33/16) = 76/171 : 33/16 = 76/171 * 16/33 = 1216/5643.

(7 14/45 : 7 - 39/40) * 7,23)0,8/(2 : 0,25 - 3,125 * 2,4) = (329/45 * 1/7 - 39/40) * 7,23)0,8/(8 - 7,5) = (47/45 - 39/40) * 7,23) 0,8/0,5 = (1880/1800 - 1755/1800) * 7,23)0,8/0,5 = (125/1800 * 723/100) * 8/10/(0,5) = (25/1800 * 723/4) * 4/5)/0,5 = (1/72 * 723/4) * 4/5) /0,5 = (1/24 * 241/4) * 4/5)/0,5 = 241/96 * 4/5) /0,5 = 241/24 * 1/5)/0,5 = 241/120 : 1/2 = 241/120 * 2 = 241/60 = 4 1/60.