15-7=( )-( )=( )-( ) ( )-( )=12-6 =( )-( ) 16-9=( )-( )=( )-( )=( )-()
问题描述:
15-7=( )-( )=( )-( ) ( )-( )=12-6 =( )-( ) 16-9=( )-( )=( )-( )=( )-()
答
15-7=(16 )-(8 )=( 17)-(9 )
(11 )-(5 )=12-6 =(13 )-(7 )
16-9=( 15)-(8 )=(14 )-(7 )=(13 )-(6)