20 17 people teach first-grade mathematics, and do oral calculations next semester 1 30-20 =
5+( )= 13
7 1-70=
1 1-8=
1 1-3=
54-4=
3+( )= 14
46-6=
36-6=
27-7=
1 1-4=
9+( )= 14
1 1-4=
13-5=
18-9=
12-5=
6+( )= 13
12-5=
73-70=
2+90=
8+30=
4+( )= 14
33-3=
12-6=
17-8=
45-40=
7+( )= 14
50-20=
4+50=
12-7=
1 1-5=
4+( )= 13
1 1-5=
26-20=
93-90=
12-3=
2+( )= 14
12-3=
13-6=
16-8=
65-50=
8+( )= 14
40-60=
1 1-4=
37-7=
26-6=
7+( )= 13
100-80=
100-90=
14-9=
12-4=
5+( )= 14
12-4=
14-6=
50+8=
13-5=
9+( )= 15
6+30=
30+70=
14-7=
2+70=
8+( )= 13
70+5=
10-8=
5+60=
53-50=
3+( )= 13
13+50=
15-6=
14-8=
14-5=
8+( )= 15
14-5=
30+4=
57-7=
1 1-7=
2+( )= 13
1 1-7=
60-20=
16-9=
62-60=
9+( )= 13
32-30=
1 1-5=
83-80=
10-4=
6+( )= 14
50-40=
39-30=
16-7=
73-70=
3+( )= 13
13-7=
10-6=
7+60=
13-4=
7+( )= 15
13-4=
62-2=
12-8=
12-5+7=
14-5+9=
13-7+6=
12-4+8=
15-8+9=
14-7+6=
1 1-6+5=
14-7+6=
1 1-2+8=
13-5+9=
15-9+4=
12-3+9=
15-9+4=
12-6+8=
16-7+5=
13-8+7=
14-6+5=
14-5+9=
13-6+5=
1 1-5+6=
12-4+8=
12-3+9=
15-6+7=
1 1-8=
1 1-3+7=
20 17 people teach first-year mathematics to do oral calculations next semester 226-24 = 80-20 = 65+24 = 81-6 = 26+50 =
80-60= 68-3 1= 23- 1= 62+2= 68-60=
72-30= 35-32= 50-39= 7+23= 90-3=
49- 1 1= 87-73= 48+22= 82- 16= 32- 12=
90-6= 37+4 1= 86-82= 4+70= 45-2 1=
3 1-8= 5+ 1 1= 76-43= 42+54= 86-46=
37-32= 25+42= 52-20= 59-22= 26- 1=
0+58= 6 1+32= 17+70= 89-46= 35+43=
89-78= 0+52= 7 1-57= 74-20= 93-52=
8 1- 1 1= 1 1+8 1= 5 1-6= 56-45= 3+5 1=
99-3 1= 58-22= 23+24= 67-4= 37+2 1=
90+7= 2 1- 10= 55-2 1= 80-22= 29+4 1=
39-35= 54- 14= 43+50= 58-9= 19-5=
89-28= 69-64= 54- 1= 19+ 1= 29- 17=
60+ 13= 92- 12= 49-5= 2+22= 63+6=
42-35= 0+96= 42-32= 62+ 17= 76-30=
9 1-70= 24+6= 85-24= 85-9= 40-2=
66+ 13= 35-3= 46+23= 99-92= 88-78=
93-53= 38-3= 36- 13= 78+ 1= 55+4 1=
97-37= 42+8= 95-24= 9 1-30= 98- 15=