а) ..........................=2 5/16
1) 2 2/5 : 1,2=2,4:1,2=2
2) 7/8 * 2=14/8=1 6/8=1 3/4
3) 1 1/8 : 2=9/8 * 1/2=9/16
4) 1 3/4+9/16=1 12/16+9/16=1 21/16=2 5/16
б) .................................= - 13 5/7
1) 5 9/11 * 1 2/9=64/11 * 11/9=64/9=7 1/9
2) 7 2/3 * 1 1/23=23/3 * 24/23=8
3) 7 1/9 - 8= - 8/9
4) 11/54 - 5/36=22/108 - 15/108=7/108
5) - 8/9 : 7/108= - 8/9 * 108/7= - 96/7= - 13 5/7