A) |-21.5|=21.5
|12.3|=12.3
|-89|=89
|4,23/53|=4,23/53
|-6,13/16|=6,13/16
|-4/127|=4/127
б) |2.12|+|-7.19|= 9.31
|-61.2|+|-71.9|=133.1
|2,7/18|+|-7,1/12|=9,2/3
|-1,1/15|+|-2,2/25|=3,11/75
в) |2.12|*|-7.19|=15.2428
|-61.2|*|-71.9|=4400.28
|3,1/18|*|-7,4/11|=22.5
|-1,1/15|*|-2,7/24|=1,5/9