文档介绍：-23+5=
+9-5=
-7-12=
-25-21=
11-19=
22-37=
-45+24=
-63+28=
15-55=
-7-11=
-5-21=
6-19=
-23+5=
+9-5=
-7-12=
-25-21=
11-19=
22-37=
-45+24=
-63+28=
15-55=
-7-11=
-5-21=
6-19=
23-31=
-4+29=
-6+18=
+9-15=
-17-19=
-25-11=
7-16=
3-42=
-29+21=
-16+17=
32-17=
-28-9=
-27-24=
18-19=
5-12=
-19+20=
-25+12=
+23-28=
-5-8=
-7-19=
6-11=
15-6=
-11+7=
-8+42=
37-82=
1
1
1
1
1
1
2
1
4
=
2
=
8
=
3
=
3
3
4
2
10 ( 31)
10 ( 31)
1 5 4
15 ( 41)
3
3
5
6
8×=
÷12=
=
÷2=
÷2=
200×=
+=
540÷900=
÷9=
+=
÷=
×100=
11×25=
÷=
10÷20=
540÷900= ÷= ÷= ×=
6÷20= ×= ÷= 800 ×=
+= = =
×4= 800×= ÷3= 11×25=
8÷÷ 400= ÷9= 49×= 12 ×25=
÷41=
÷÷ =
+=
÷÷ =
×400=
200×=
÷=
×= 10÷20= ×= ÷=
×7= += ÷100= =
÷+= ×= += ×3=
×5= +=