6. 28+42:7-6 96-72:9+15 32+56:8-7 100-7.8 90-8.8 80-9.8 74:=8 (ост. [ 65:=7 (ост. [ 85:=9 (ост. [

Ответ: 28+42:7-6 = 28; 96-72:9+15 = 103; 32+56:8-7 = 32; 100-7\(\cdot\)8 = 44; 90-8\(\cdot\)8 = 26; 80-9\(\cdot\)8 = 8; 74:9=8 (ост. 2); 65:9=7 (ост. 2); 85:9=9 (ост. 4)

• 28+42:7-6 = 28 + 6 - 6 = 34 - 6 = 28
• 96-72:9+15 = 96 - 8 + 15 = 88 + 15 = 103
• 32+56:8-7 = 32 + 7 - 7 = 39 - 7 = 32
• 100-7\(\cdot\)8 = 100 - 56 = 44
• 90-8\(\cdot\)8 = 90 - 64 = 26
• 80-9\(\cdot\)8 = 80 - 72 = 8
• 74: \(\boxed{9}\,\) =8 (ост. 2)
• 65: \(\boxed{9}\,\) =7 (ост. 2)
• 85: \(\boxed{9}\,\) =9 (ост. 4)

Ответ: 28+42:7-6 = 28; 96-72:9+15 = 103; 32+56:8-7 = 32; 100-7\(\cdot\)8 = 44; 90-8\(\cdot\)8 = 26; 80-9\(\cdot\)8 = 8; 74:9=8 (ост. 2); 65:9=7 (ост. 2); 85:9=9 (ост. 4)