87 ⋅ 64 + 87 ⋅ 36 = 87 ⋅ (64 + 36) = 87 ⋅ 100 = 8700
39 ⋅ 16 + 39 ⋅ 4 = 39 ⋅ (16 + 4) = 39 ⋅ 20 = 780
96 ⋅ 77 - 96 ⋅ 76 = 96 ⋅ (77 - 76) = 96 ⋅ 1 = 96
48 ⋅ 61 - 40 ⋅ 61 = 61 ⋅ (48 - 40) = 61 ⋅ 8 = 488
24 ⋅ 49 + 24 = 24 ⋅ (49 + 1) = 24 ⋅ 50 = 1200
34 ⋅ 21 - 34 = 34 ⋅ (21 - 1) = 34 ⋅ 20 = 680
Ответ: 8700; 780; 96; 488; 1200; 680