87⋅64+87⋅36=8400. 39⋅16+39⋅4 = 780 96⋅77-96⋅76= 48⋅61-40⋅61= 24⋅49+24= 34⋅21-34=

Решение:

1. 87 ⋅ 64 + 87 ⋅ 36 = 8400
   • 87 ⋅ 64 = 5568
   • 87 ⋅ 36 = 3132
   • 5568 + 3132 = 8700
2. 39 ⋅ 16 + 39 ⋅ 4 = 780
   • 39 ⋅ 16 = 624
   • 39 ⋅ 4 = 156
   • 624 + 156 = 780
3. 96 ⋅ 77 - 96 ⋅ 76 =
   • 96 ⋅ 77 = 7392
   • 96 ⋅ 76 = 7296
   • 7392 - 7296 = 96
4. 48 ⋅ 61 - 40 ⋅ 61 =
   • 48 ⋅ 61 = 2928
   • 40 ⋅ 61 = 2440
   • 2928 - 2440 = 488
5. 24 ⋅ 49 + 24 =
   • 24 ⋅ 49 = 1176
   • 1176 + 24 = 1200
6. 34 ⋅ 21 - 34 =
   • 34 ⋅ 21 = 714
   • 714 - 34 = 680