(个)
2+1=
4-0=
5-0=
4-2=
3+2=
4+1=
4-4=
3+0=
5+0=
3-3=
3-2=
5-4=
1+1=
4-3=
4-1=
5-3=
比 ( )2个。 □○□
(只)
( )+( )=( )
4
6
9
3
1
20,15,、、
2,4,、、,12
+1 ÷1 8.99×9.9990
0.6+4.5= ﹣ = 2÷ = 2.5:6=
125%×8= 18÷54= 0.5×2.4= : =