1. 直接写出得数。
68 + 39 = 85 - 37 = 240 - 117 = 24 ÷ 2 × 9 =
100 - 56 = 120 + 49 = 76 + 49 = 70 ÷ (86 - 79) =
45 ÷ 3 = 130 × 6 = 75 ÷ 5 = 300 × 4 - 28 =
60 ÷ 5 = 3 × 55 = 65 × 8 = 402 ÷ 2 ÷ 3 =
71 × 9 = 549 ÷ 9 = 93 × 5 = 57 ÷ (9 ÷ 3) =
105 × 4 = 45 × 4 = 36 × 7 = 16 + 78 - 69 =
26 × 3 = 204 ÷ 3 = 140 ÷ 5 = (36 + 44) × 4 =
31 × 6 = 53 × 7 = 96 × 0 = 8 × (76 + 44) =

1. 107 48 123 108
44 169 125 10
15 780 15 1172
12 165 520 67
639 61 465 19
420 180 252 25
78 68 28 320
186 371 0 960

2. 计算下面各题。
320 ÷ 4 × 6 760 ÷ (134 - 126) (373 + 522) × 9
445 ÷ 5 - 58 (1002 - 82) ÷ 4 490 × (62 - 55)

2. 480 95 8055
31 230 3430

3. 在$□$里填合适的数。
$□$ ÷ 5 - 45 = 90 80 + $□$ ÷ 5 = 120
($□$ + 36) × 8 = 1600 (76 - $□$) × 8 = 48
($□$ - 70) ÷ 8 = 12 54 ÷ ($□$ × 3) = 6

3. 675 200
164 70
166 3