四年级下暑假园地p63智力乐园ab*ba-----------------------（)()()()()()----------------------------2()01

Question

四年级下暑假园地p63智力乐园
a b
* b a
-----------------------
（ )( )( )
( )( )( )
----------------------------
2 ( ) 0 1

Answer 1

a b
x b a
-------------------
(5) (1) (1)
(2) (1) (9)
-------------------
2 (7) 0 1