一、口算。
500 - 85 =
185 ÷ 5 =
126 ÷ 6 × 5 =
121 + 38 =
130 × 30 =
978 - (78 + 335) =
550 ÷ 11 =
455 ÷ 5 =
1500 ÷ (75 ÷ 3) =
85 + 25 =
600 × 90 =
4500 ÷ 50 ÷ 9 =
58 ÷ 2 =
152 - 103 =
512 - 144 ÷ 12 =
70 × 27 =
720 ÷ 60 =
25 × (40 - 32) =
103 + 67 =
64 - 38 =
32 × 2 × 5 =
105 × 6 =
360 ÷ 12 =
(180 + 90) ÷ 9 =
220 ÷ 4 =
46 - 27 =
26 × 25 × 4 =
32 × 5 =
90 × 80 =
45 × 16 × 2 =
500 - 85 =
415
185 ÷ 5 =
37
126 ÷ 6 × 5 =
105
121 + 38 =
159
130 × 30 =
3900
978 - (78 + 335) =
565
550 ÷ 11 =
50
455 ÷ 5 =
91
1500 ÷ (75 ÷ 3) =
60
85 + 25 =
110
600 × 90 =
54000
4500 ÷ 50 ÷ 9 =
10
58 ÷ 2 =
29
152 - 103 =
49
512 - 144 ÷ 12 =
500
70 × 27 =
1890
720 ÷ 60 =
12
25 × (40 - 32) =
200
103 + 67 =
170
64 - 38 =
26
32 × 2 × 5 =
320
105 × 6 =
630
360 ÷ 12 =
30
(180 + 90) ÷ 9 =
30
220 ÷ 4 =
55
46 - 27 =
19
26 × 25 × 4 =
2600
32 × 5 =
160
90 × 80 =
7200
45 × 16 × 2 =
1440
答案
415 37 105 159 3900 565 50 91 60 110 54000 10 29 49 500 1890 12 200 170 26 320 630 30 30 55 19 2600 160 7200 1440
解析
500 - 85 = 415
185 ÷ 5 = 37
126 ÷ 6 × 5 = 105
121 + 38 = 159
130 × 30 = 3900
978 - (78 + 335) = 565
550 ÷ 11 = 50
455 ÷ 5 = 91
1500 ÷ (75 ÷ 3) = 60
85 + 25 = 110
600 × 90 = 54000
4500 ÷ 50 ÷ 9 = 10
58 ÷ 2 = 29
152 - 103 = 49
512 - 144 ÷ 12 = 500
70 × 27 = 1890
720 ÷ 60 = 12
25 × (40 - 32) = 200
103 + 67 = 170
64 - 38 = 26
32 × 2 × 5 = 320
105 × 6 = 630
360 ÷ 12 = 30
(180 + 90) ÷ 9 = 30
220 ÷ 4 = 55
46 - 27 = 19
26 × 25 × 4 = 2600
32 × 5 = 160
90 × 80 = 7200
45 × 16 × 2 = 1440
185 ÷ 5 = 37
126 ÷ 6 × 5 = 105
121 + 38 = 159
130 × 30 = 3900
978 - (78 + 335) = 565
550 ÷ 11 = 50
455 ÷ 5 = 91
1500 ÷ (75 ÷ 3) = 60
85 + 25 = 110
600 × 90 = 54000
4500 ÷ 50 ÷ 9 = 10
58 ÷ 2 = 29
152 - 103 = 49
512 - 144 ÷ 12 = 500
70 × 27 = 1890
720 ÷ 60 = 12
25 × (40 - 32) = 200
103 + 67 = 170
64 - 38 = 26
32 × 2 × 5 = 320
105 × 6 = 630
360 ÷ 12 = 30
(180 + 90) ÷ 9 = 30
220 ÷ 4 = 55
46 - 27 = 19
26 × 25 × 4 = 2600
32 × 5 = 160
90 × 80 = 7200
45 × 16 × 2 = 1440
二、计算下面图形的面积。


答案
35×44÷2=770(cm²) (40÷2−12)×9=72(cm²)
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