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Verified answer

a) 23199:57=407

4 1/2*5 2/3=9/2*17/3=51/2

51/2*2=51

51:13 1/2=51*2/27=102/27=3 7/9

407+3 7/9=410 7/9

б) 7137:549=13

13*3/4=39/4

10 3/4-1 5/6=10 9/12-1 10/12=8 11/12

5 3/20-4 1/4=5 3/20-4 5/20=9/10

8 11/12:9/10=107/12*10/9=535/54

39/4+535/54=1053/108+1070/108=

2123/108=19 71/108