在408÷8中,被除数增加 ,商就增加2.
( )-258=159 256+( )=589
( )+356=912 128-( )=11
( )+125=352 408-( )=205
( )+351=652 125-( )=22
( )+325=561 641-( )=365 ( )-158=369 356+( )=515