课堂练习
(一) (二) (三)
69-7-50= 35+35+10= 9+60+1=
83-40-8= 25+25+5= 28+40+2=
78-50-9= 60+3+20= 3+19+7=
44-3-4= 40+8+10= 9+ 5+ 8=
94-7-7= 52+30+7= 5+19+6=
45-30-4= 5+32+7= 28-16+2=
20-7-6= 67+0+9= 42+50-14=
15-6-9= 50+24+6= 50+50-34=
14-0-9= 9+37+20= 80-6+24=
17-9+5= 18+20+5= 4+30-8=
12-8+13= 16+18+30= 35+40+7=
35+8+40= 18+7+4= 24-14+70=
40+7+40= 17+15+3= 9+57-40=
13+50+5= 63+17+1= 93-9+10=
34+6+40= 85+8+2= 12-7+8=
70+25+5= 7+40+13= 28-6+30=
40+9+30= 26+0+20= 64-6-40=
14+70+7= 50+5+5= 78-78+0=
(四) (五) (六)
26-17-8= 2-7+7= 59-9-7=
28+10+2= 24-0+18= 29-8-10=
75-50+4= 16+75-9= 95-95-0=
40-15+60= 6+80-3= 72-2-30=
15-9+11= 34-7+8= 58-5-30=
34-4+26= 9+47-30= 75-20-30=
35+30-40= 78-70+8= 64-6-50=
7+64-50= 28+30-4= 48-9-9=
49-9+17= 79-7+10= 100-50-5=
4+30-10= 93-9+20= 28-6-12=
47+9-30= 6+74-3= 42-0-1=
47+9-20= 40+50-60= 27-7-0=
80-6+4= 85-40+5= 18-9+8=
45-5+20= 52+40-4= 100-40-7=
38+14-30= 42+6-9= 49-30-9=
54-15+9= 17-9+7= 56-6-30=
99-50+6= 18-6+8= 74-30-6=
4+15-10= 16+5-7= 85-6-9=
3+26+9= 48-12-5= 29-7-1=
(七) (八) (九)
25+5+23= 41+5+10= 87-80+70=
90-9-80= 67-67+20= 3+60-20=
74-6-10= 90-4+9= 47-20-6=
30-10+1= 29+4-10= 9+38+40=
40+4+6= 48+9-7= 100-80+45=
18+8-20= 24-7+6= 20+50-2=
100-40+26= 52+9+24= 47-30+7=
96-80+9= 60-30+15= 52+14-30=
70-7+30= 23-6+40= 26-3+30=
54-4+24= 27+30-8= 16-7+8=
60+25+4= 47+19-30= 17+8+9=
62-5+7= 39+9-7= 13-5+70=
86-30-7= 30-10+20= 25+10-20=
27+7-9= 70-30+44= 46+30-60=
86-63-2= 62+7-6= 25+30+20=
63-60+38= 400-40-60= 56-20-19=
8+19-27= 6+34+20= 28+30+9=