4-1= 6+1= 7-3= 3+4=
2+3= 4+1= 5-2= 0+5=
1+3= 5-1= 2-0= 7-4=
6-5= 2+5= 8-5= 2+2=
(个)
□○□=□(个)
(棵)
>>>>>
1920 14+620 15-415-2
33=6 73=4 4+=8 53=42
2﹣30%= +25%= 4.23﹣23%= ×=
3+= 4×15%= = +50%=