Verified answer

1) 13*86/450= 13*43/225= 559/225

2) 559/225:0,26= 559/225: 26/100= 559/225: 13/50= 559/225*50/13= 43/9*2= 86/9

3) 86/9-10/9= 76/9

4) 76/9+57*14/27= (228+798)/27= 1026/27=38

Ответ: 38