二、解决问题
★信息窗1-2
建议用时:6分钟
实际用时:分钟
45÷5 =
72÷9 =
14÷2 =
56-7 =
48÷8 =
25÷5 =
14÷4 =
60÷9 =
26÷5 =
39÷6 =
52÷7 =
18+70 =
70+220 =
910-300 =
150-30 =
43-5 =
80-2 =
91-5 =
74-37 =
48+9 =
39+7 =
52+8 =
75+46 =
17+36 =
179+62 =
53+9 =
400+3000 =
90-50 =
32-8 =
280-70 =
170+300 =
43-27 =
340-340 =
76-35 =
205+40 =
50+650 =
760-280 =
450-80 =
860+90 =
170+480 =
970-150 =
20-12 =
53÷9 =
80+300 =
450-6 =

45÷5 = 9
72÷9 = 8
14÷2 = 7
56-7 = 49
48÷8 = 6
25÷5 = 5
14÷4 = 3……2
60÷9 = 6……6
26÷5 = 5……1
39÷6 = 6……3
52÷7 = 7……3
18+70 = 88
70+220 = 290
910-300 = 610
150-30 = 120
43-5 = 38
80-2 = 78
91-5 = 86
74-37 = 37
48+9 = 57
39+7 = 46
52+8 = 60
75+46 = 121
17+36 = 53
179+62 = 241
53+9 = 62
400+3000 = 3400
90-50 = 40
32-8 = 24
280-70 = 210
170+300 = 470
43-27 = 16
340-340 = 0
76-35 = 41
205+40 = 245
50+650 = 700
760-280 = 480
450-80 = 370
860+90 = 950
170+480 = 650
970-150 = 820
20-12 = 8
53÷9 = 5……8
80+300 = 380
450-6 = 444

拓展园地
请按照下列图形的规律，补全最后一个图形。

答：在第四个正方形内的左侧绘制一个和前三个图形大小相同的圆形，圆形的右侧连接一条水平向右、长度和图中已有线段相等的线段。