3+2=?,7+?=19,17+?=25 ?-3=7,?-15=15,?-24=28 42-?=10,32-?=18,50-?=17 16+16=?,54+26=?,108-75=? 3*3=?,3*4=?,3*5=? --- ?+12=24-11,38-?=16+14 16+?+32=60,15+25+35+45=? 19+?=45-?,22+19+18+33=? 28-?=?-13,25-18+29-24=?
3
+
2
=
7
+
=
19
17
+
=
25
-
3
=
7
-
15
=
15
-
24
=
28
42
-
=
10
32
-
=
18
50
-
=
17
16
+
16
=
54
+
26
=
108
-
75
=
3
×
3
=
3
×
4
=
3
×
5
=
+
12
=
24
-
11
38
-
=
16
+
14
16
+
+
32
=
60
15
+
25
+
35
+
45
=
19
+
=
45
-
22
+
19
+
18
+
33
=
28
-
=
-
13
25
-
18
+
29
-
24
=
春天放风筝