62-4=
58-9=
50+30=
37+4=
68-60=
89+5=
17-8=
99-30=
25-(18-9)=
55-(5+4)=
60+7+20=
29+40-20=
12-5=
11-8=
7+5=
6+7=
13-4=
16-9=
15-7=
5+8=
6+8=
8+8=
14-6=
= 2.4×5= = 0.32=
= = =