6 11/12 + 3 15/16 = 83/12 + 54/16 = 332/48 + 162/48 = 494/48 = 247/24 = 10 7/24 Ответ : 10 целых 7/24
1)х - 2 7/12=5 3/18
х= 2 7/12+5 3/18
х= 2 21/36+5 6/36
х=7 27/36
х=7 3/4
2)х - 26 7/21 = 100 - 5/28
x = 99 23/28 + 26 1/3
x = 99 69/84 + 26 28/84
x = 126 13/84
3)х - 37 17/54=15 16/45
х=15 16/45+37 17/54
х=15 96/270+37 85/270
х=52 181/270
4)х - 33 21/25=42 17/35
х=42 17/35+33 21/25
х=42 85/175+33 147/175
х=75 232/175=76 57/175