a) 4567 + ( 1234 - 4567) - 4
= 4567 - 3333 -4 = 1230
b) 2001 - (53 + 1579) - (-53)
= 2001 - 1632 + 53 = 422
c) 35 - 17 + 2017 - 35 + (-2017)
= (35 - 35) - 17 + [2017 + (-2017)]
= -17
d)37 + (-17) -37+77
= (37 - 37) -17 + 77
= 60
e)-(-2019) + (-2019) - 401 + 12
= 2019 - 2019 - 401 + 12
= -389
f)/-85/ -(-3) . 15
= /-85/ + 45
= 85 + 45 = 130
g)11.107+ 11.18 - 25.11
= 11 . ( 107 + 18 - 25 )
= 11 . 100 = 1100
i) 115 - (-85) + 53 - (-500+ 53)
= 115 + 85 + 53 + 500 - 53
= 115 + 85 + 500 = 700
k)(-18) + (-31) + 98 + /-18/ + (-69)
= (-18) -31 + 98 + 18 -69
= -31 + 98 - 69 = -2
l) 17.(15-16)+16.(17-20)
= 17.(-1)+16.(-3) = -17 - 48 = -65
m) 15.(-176)+15.76+100.15
= 15.[(-176)+76+100] = 15 . 0 = 0
n) 79.89-79.(-11)-100.79
= 79.(89+11-100) = 79 . 0 = 0