5/12*4+7=20/3+7/1=41/3
4/9*3/4+2/3=1/3+2/3=1
2/5*1 3/5+1 1/45=2/5*18/5=36/25+1 1/45=1 329/225
1 целая одиннадцать тринадцатых
128*12=128*10+128*2=1280+256=1536
1249*54=1249*50+1249*4=62450+4996=67446
397*28=397*20+397*8=7940+317611116
27893*32=27893*30+27893*2=836790+55786=892576
5/16 - 1/6 =(5 × 3 - 1 × 8)/48 = 15/48 - 8/48 = 7/48