二、解决问题
★信息窗1-1
建议用时:6分钟
实际用时:分钟
86-60 =
800-190 =
19+35 =
28+44 =
270+330 =
46-29 =
30+47 =
730-230 =
360+60 =
56-7 =
420+220 =
560-90 =
65+35 =
650-90 =
140+38 =
38-19 =
96+800 =
46+38 =
45+38 =
870+30 =
106+40 =
74-50 =
310-290 =
110-80 =
25+25 =
40+380 =
148+30 =
42-16 =
29+150 =
960-750 =
200+400 =
75+9 =
870-150 =
80+70 =
1400+300 =
70-16 =
700+200 =
9000-4000 =
57÷8 =
990-900 =
82-8 =
800+700 =
130-50 =
160-80 =
1500-600 =

86-60 = 26
28+44 = 72
30+47 = 77
56-7 = 49
65+35 = 100
38-19 = 19
45+38 = 83
74-50 = 24
25+25 = 50
42-16 = 26
200+400 = 600
80+70 = 150
700+200 = 900
990-900 = 90
130-50 = 80
800-190 = 610
270+330 = 600
730-230 = 500
420+220 = 640
650-90 = 560
96+800 = 896
870+30 = 900
310-290 = 20
40+380 = 420
29+150 = 179
75+9 = 84
1400+300 = 1700
9000-4000 = 5000
82-8 = 74
160-80 = 80
19+35 = 54
46-29 = 17
360+60 = 420
560-90 = 470
140+38 = 178
46+38 = 84
106+40 = 146
110-80 = 30
148+30 = 178
960-750 = 210
870-150 = 720
70-16 = 54
57÷8 = 7……1
800+700 = 1500
1500-600 = 900

拓展园地
请按照下列图形的规律,补全最后一个图形。

最后一个图形的4个五角星位置如下：
第一行第1格、第一行第4格、第四行第1格、第四行第4格各画1个五角星。
答：补全后的图形四个五角星分别位于4×4方格的四个角位置。