a ) -15 - ( -14 ) =
= -15 + 14
= -1
b ) -15 x ( -2 ) - ( -4 ) =
= 30 + 4
= 34
c ) ( -2 )³⁵ : ( -2 )³³ - 2³⁴ : ( -2 )³² =
= ( -2 )² - 2³⁴ : 2³²
= 4 - 2²
= 4 - 4
= 0
d ) -11 + [ 1 + 2 x ( 1 - 12 ) ] x [ 81 - 7 x ( -31 + 40 ) ] =
= -11 + [ 1 + 2 x ( -11 ) ] x [ 81 - 7 x 9 ]
= -11 + [ 1 - 22 ] x [ 81 - 63 ]
= -11 - 21 x 18
= -11 - 378
= -389