Решить по (20 8/15*7 1/2-54 3/5*2/5): (3 13/21* 8 2/5-29 2/5)- 5/6 *1 1/5+21/25

(20 8/15*7 1/2-54 3/5*2/5): (3 13/21* 8 2/5-29 2/5)- 5/6 *1 1/5+21/25 = (154 -546/25 ): (152/5-292/5)- 1+21/25 = 3304/25 : (-28) -1 +21/25 = -118/25 -1 +21/25 = -118-25+21/25 = -122/25 = -4 22/25