6
7
8
(1)不进退位加减类
( ) 5 4 ( ) ( ) 1 8 ( ) + 4 ( ) + ( ) 6 - 3 ( ) -( ) 4
6 2 7 4 4 5 3 6
(2)进退位加减类
9
(3)加减混合类
(4)其他符号类
A=____
◆ =____
B=____ ★=_____ C=____ = =____
D=____ = =____
三、动脑经想出答案。
(1)◆+◆+◆=15 ○×◆=30 ◆=( ) ○=( (2)★+★+★+★=16 ◎-★=16 ◎=( ) ★=((3) + =8 × =20 - =2 =( ) = =( ) =( ) (4)A+B=9 A+A+B=13 A=( ) B=( )
10
)
)