9+20=
11-2=
+ =
43+30= | 43+3= |
+=
□○□=□(本)
答:两个班共捐了( )本书。
□○□=□(根)
20+= 25 51 -= 50 90 += 94
+=33 62-= 60 78 - 8 =
35+4= 5+43= 58-20= 12+6+60=
50+28= 38+40= 76-20+10= 5×4-16=
42+8= 52-6= 37+6= 26+7=
18-8= 19-5= 4+14= 15-6=
20-5= 2+16= 60+( )=75 ( )=19+20
口答: