文档介绍：40-2=
70+90=
70+2=
140-7=
70+50=
421
+ 72
52+35=
720
+ 8=
9
X799弋
9X799=
80
+ 4=
26+9=
45X28Q
160-60= 160
+ 8=
150+40=
2100
+ 3=
50
X80=
28+7=
500
X4=
24
+ 8=
12X20=
35
+ 5=
50
+ 5=
3X800=
420
+ 7=
3
X220=
480+4=
58
+ 33=
420
-20=
93+3=
880
+ 4=
1200
-200=
11 7=
80
- 46=
82
+ 92
45+45=
50
X90=
42
X98Q
5X5+52=
90+30= 90+40=
170-90=
110-30=
50+80=
110-80=
50+90=
400+300=
21 X 30=
660
+ 6=
65
X 10=
540+6=
22
X40=
80
X80=
10 47=
30
X70=
0
+ 93=
600+6=
10
X36=
660
+ 3=
43+38=
720
+ 8=
36
+ 56=
23X30=
10
X73=
90
x 50=
800+8=
6000
+2000=
120
X4=
640+2=
52
X94Q
250
+ 5=
63+9=
280
+ 4=
50
X 50=
810+9=
300
x 6=
25+41=
140+7=
20
X31 =
90-65=
52X44Q
74
X 542
41
X75Q
40X70=
131
+ 62
900
+ 3=
57+29=
125
- 22
4 X9-6=
90 9=
1600
+ 2=
71-68=
600+1 =
1500
+ 3=
9
300=
600+3=
48
+ 28=
641
+ 82
480+8=
7
X 50=
880
+ 8=
879+8Q
9
X500=
80
+ 17=
54+28=
42
X3=
1700
800=
90 3=
180
+ 3=
300
+ 5=
930 3=
800
+ 4=
60
— 15=
900 3=
450
+ 9=
360
+ 6=
37+56=
32
X3=
70
X7=
1200- 715=
299
+ 62
50
X7=
0X37=
53
—14=
17
+ 27=
840 4=
2
X 14=
140
+ 2=
660 6=
7
X800=
7 X 700=
840+2=
430
2=
540
+ 9=
31X3=
13
3=
34
+ 56=
96+3=
2
330=
50
x 6=
159+4Q
620
+ 2=
6
X800=
960+3=
1500
-903=