a/ 4.25+12.25+170:10
=100+300+17
=400+17
=417
b/ (7+3^3+3^2).4-5^3
=(7+27+9).4-125
=43.4-125
=172-125
=47
c/12:{400:[500-(125+25.7)]}
=12:{400:[500-(125+175)]}
=12:{400:[500-300]}
=12:{400:200}
=12:2
=6
d/168+{[2.(2^4+3^2)-256^0]:7^2}
=168+{[2.(16+9)-256^0]:7^2}
=168+{[2.25-1]:7^2}
=168+{[50-1]:7^2}
=168+{49:49}
=168+1
=169