1)(15/28 -11/36)*21/29+6 6/7: 16/21): 16 1/2. /-дробь 2) (20 8/15*7 1/2 - 54 3/5 : 2 1/2): (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