1. 直接写出得数。
49 + 26 =
61 - 38 =
40 × 15 =
75 + 49 + 25 =
22 + 56 =
75 × 2 =
560 ÷ 70 =
25 × 13 × 4 =
480 ÷ 8 =
30 × 15 =
603 ÷ 9 =
50 × 6 ÷ 10 =
17 × 40 =
16 × 60 =
55 × 6 =
77 × 4 × 5 =
25 × 80 =
126 ÷ 6 =
440 ÷ 11 =
390 ÷ 13 ÷ 2 =
240 ÷ 12 =
860 ÷ 20 =
369 ÷ 9 =
365 - 65 + 30 =
320 ÷ 8 =
560 ÷ 14 =
80 × 55 =
3200 ÷ 16 ÷ 25 =
12 × 80 =
195 ÷ 13 =
702 × 3 =
18 × 137 - 18 × 37 =
49 + 26 =
75
61 - 38 =
23
40 × 15 =
600
75 + 49 + 25 =
149
22 + 56 =
78
75 × 2 =
150
560 ÷ 70 =
8
25 × 13 × 4 =
1300
480 ÷ 8 =
60
30 × 15 =
450
603 ÷ 9 =
67
50 × 6 ÷ 10 =
30
17 × 40 =
680
16 × 60 =
960
55 × 6 =
330
77 × 4 × 5 =
1540
25 × 80 =
2000
126 ÷ 6 =
21
440 ÷ 11 =
40
390 ÷ 13 ÷ 2 =
15
240 ÷ 12 =
20
860 ÷ 20 =
43
369 ÷ 9 =
41
365 - 65 + 30 =
330
320 ÷ 8 =
40
560 ÷ 14 =
40
80 × 55 =
4400
3200 ÷ 16 ÷ 25 =
8
12 × 80 =
960
195 ÷ 13 =
15
702 × 3 =
2106
18 × 137 - 18 × 37 =
1800
答案
1. 75 23 600 149 78 150 8 1300 60 450 67 30 680 960 330 1540 2000 21 40 15 20 43 41 330 40 40 4400 8 960 15 2106 1800
2. 计算下面各题,能简算的要简算。
7 × 102 - 2 × 7
985 - 728 ÷ 26 × 35
25 × (4 + 8) × 125
90 × 42 + 90 × 18
203 × 33 - 9 × 11
211 - 25 × 32 ÷ 8
7 × 102 - 2 × 7
985 - 728 ÷ 26 × 35
25 × (4 + 8) × 125
90 × 42 + 90 × 18
203 × 33 - 9 × 11
211 - 25 × 32 ÷ 8
答案
2. 700 5 37500 5400 6600 111
解析
7×102 - 2×7
=7×(102 - 2)
=7×100
=700
985 - 728÷26×35
=985 - 28×35
=985 - 980
=5
25×(4 + 8)×125
=25×12×125
=(25×4)×(3×125)
=100×375
=37500
90×42 + 90×18
=90×(42 + 18)
=90×60
=5400
203×33 - 9×11
=203×33 - 33
=33×(203 - 1)
=33×202
=33×(200 + 2)
=33×200 + 33×2
=6600 + 66
=6666
211 - 25×32÷8
=211 - 25×4
=211 - 100
=111
1
=7×(102 - 2)
=7×100
=700
985 - 728÷26×35
=985 - 28×35
=985 - 980
=5
25×(4 + 8)×125
=25×12×125
=(25×4)×(3×125)
=100×375
=37500
90×42 + 90×18
=90×(42 + 18)
=90×60
=5400
203×33 - 9×11
=203×33 - 33
=33×(203 - 1)
=33×202
=33×(200 + 2)
=33×200 + 33×2
=6600 + 66
=6666
211 - 25×32÷8
=211 - 25×4
=211 - 100
=111
1
如图,长方形的长为 12 厘米,宽为 6 厘米,把它的长 3 等分,宽 2 等分,然后在长方形内取一点,把这一点与部分等分点及部分顶点相连接。求涂色部分的面积。

答案
12×(6÷2)÷2+6×(12÷3)÷2=30(平方厘米)(方法不唯一)
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