1 : :

) - 7 + 4 - ( - 3 + 2 ) =
) + 55 - 108 + 15 -28 =
) - 15 + 25 - 13 - 8 =

2 : ̃ :

) - 3 - { + 25 - ( 18 - 25 ) + ( - 9 + 3 ) } - 8 =
) { - 5 + ( 15 - 8 ) + ( 13 - 3 ) } =
) ( 16 + 9 ) - ( 25 - 18 ) =
​