15-7= 13-6= 18-9= 14-8=
40+8= 25-20= 52-2= 6+30=
74-4= 3+20= 66-6= 30+5=
12-9+8= 16-7+8= 89-80+4= 8+6+4=
11-3=
25-5=
14-6+4=
53-3=
8+70=
13-9+10=
66-60=
19-7=
73-70+14=
= (个) = (个)
24-4= 10+8= 14-9= 9+8=
67-7= 80+6= 10-6= 12-7=
8+8-10= 68-60+6= 46-6+3=
15-( )=8 10-( )=7 7+( )=47
8+70= 91-90= 4+50= 15-8+4=
50-20= 88-8= 67-60= 75-5+9=
13-6= 14-8= 14-7+3=
7+8= 11-9= 8+5-3=
16-8= 11-7= 19-9-4=
83-3= 64-60= 2+90=
20+7 81-3 64+7 42-40 37-2
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