|
2 |
|
|
|
9 |
|
7 |
|
|
|
和一样多,○比△多个,比少2个。
2+3= 4-1= 0+2= 2+5=
9-4= 8-5= 6+3= 4+5=
3-3= 6-0= 9-7= 8-7=
3+3= 5-1= 1+( )= 6 4+( )=8
8+1= 9-8= ( )-( )=0 ( )+( )=8
最少有棵,最多有棵。