a)
= 80 - (4.25-3.8)
= 80 - (100-24)
= 80 - 76
= 4
b)
= 144 - 4(5)^2 : 4 - 1
= 144 - 4 .25 : 4 - 1
= 144 - 25 - 1
= 118
c)
= 125 . 176 - (125 . 51 + 3125)
= 22000 - 9500
= 12500
d)
= 303 - 3 . [655−10⋅4^3+5] : 1
= 303 - 3 . [655−10⋅64+5] : 1
= 303 - 3 . 20 : 1
= 303 - 60
= 243