1. 直接写出得数。
540 - 50 = 270 + 330 = 360 ÷ 9 = 810 ÷ 9 ÷ 3 =
30 × 33 = 240 ÷ 8 = 800 ÷ 4 = (120 + 40) ÷ 4 =
360 × 6 = 29 × 30 = 300 × 5 = 16 × (4 + 86) =
91 × 7 = 93 ÷ 3 = 906 ÷ 3 = 47 + 13 × 3 =
95 × 20 = 246 ÷ 6 = 51 × 70 = 23 × 5 + 15 =
16 × 50 = 115 × 5 = 355 ÷ 5 = 15 × 6 - 74 =
80 × 35 = 420 × 3 = 72 × 50 = 72 ÷ (22 - 14) =
113 × 4 = 62 × 50 = 480 × 3 = (41 + 31) ÷ 8 =

1. 490 600 40 30
990 30 200 40
2160 870 1500 1440
637 31 302 86
1900 41 3570 130
800 575 71 16
2800 1260 3600 9
452 3100 1440 9

2. 计算下面各题。
145 ÷ 5 × 3 (540 - 487) × 86 756 ÷ (42 ÷ 6)
29 × 35 + 677 735 ÷ 5 + 255 (124 + 646) ÷ 7

2. 87 4558 108
1692 402 110

一共有()个三角形。

思维提升
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