( )+ ( )-(9)=4
 +      -        -
( ) - ( )×( )=4
 ÷       ×     -
( )+ ( )- ( )=4
 ‖       ‖     ‖
 4       4      4
(10)+(3)-(9)=4
  +     -    -
(6)-(2)x(1)=4
  /     x    -
(4)+(4)-(4)=4
 ||    ||   ||
 4     4     4