a, 1234 - 370 - 1234 = -370
b, -92 - 65 + 92 = -68
c, 195 - 195 + 87 = 87
d, -43 - 25 - 75 + 43 = -100
e, 18 + 29 + 158 - 18 - 29 = 158
f, 13 - 135 + 49 - 13 - 49 = -135
a) ( 1234 - 370 ) - 1234
= ( 1234 - 1234 ) - 370
= 0 - 370
= - 370
b) ( - 92 ) - ( 65 - 92 )
= ( - 92 + 92 ) - 65
= 0 - 65
= - 65
c) 195 - ( 195 - 87 )
= ( 195 - 195 ) - 87
= 0 - 87
= - 87
d) ( - 43 - 25 ) - ( 75 - 43 )
= ( - 43 + 43 ) - ( 25 + 75 )
= 0 - 100
= - 100
e) ( 18 + 29 ) + ( 158 - 18 - 29 )
= ( 18 - 18 ) + ( 29 - 29 ) + 158
= 0 + 0 + 158
= 158
f) ( 13 - 135 + 49 ) - ( 13 + 49 )
= ( 13 - 13 ) + ( 49 - 49 ) - 135
= 0 + 0 - 135
= - 135
