№1
3467, 3476, 3647, 3674, 3746, 3764
4367, 4376, 4637, 4736, 4673, 4763
6347, 6437, 6374, 6473, 6734, 6743
7346, 7436, 7364, 7463, 7643, 7346
№2
1) 4000 + 65500 - 20000 = 69500-20000 = 49500
2) 20000 - 8500 - 6000 = 11500 − 6000 = 5500
3) 55000 + 6000 - 24000 = 61000 − 24000 = 37000
4) 50000 - 8000 - 600 = 42000 − 600 = 41400
№5
1) а+347=1000
а= 1000-347
а= 653