+30=65 15-=8 -9=9 20-=8
28+=35 -40=38 32+=32-
20+40> -6<46 +8>39
= (本)
口答:小宁和小亮一共有本课外书。
74-3=
74-30=
36-20=
36-2=
54-20=
54-2=
87-4-20=
87-40-2=
30+= 30-
= (根)
= (根)
改正: 改正:
79-56=
57+38=
82-45=
20+7 = 30-20 = 90+9= 60-30 = 24+6 =
51+8= 7+83= 85-5 = 90-70= 45+20=
96-7 = 65+20= 39+8= 4+65=
18+50-7= 80-60+35= 90-(60+30)= 63-(76-70)=
-30=21 87-=50 7+<20 16+40=49+
40+370 5769-12 6+5086-40