a) 4.25 - 12.5 + 170 : 10
= 100 - 60 + 17
= 40 +17
= 57
b) (7 + 33 : 32).4 - 3
= (7 + 27 : 9).4 - 3
= (7 + 3).4 - 3
= 10.4 - 3
= 40 - 3
= 37
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. (24 + 32) - 2560] : 72}
= 168 + {[2. (16 + 9) - 1] : 49}
= 168 + {[2. 25 - 1] : 49}
= 168 + {[50 - 1] : 49}
= 168 + {49 : 49}
= 168 + 1
= 169
a) 4.25 - 12.5 + 170 : 10 = 100 - 60 + 17
= 40 +17
= 57
b) (7 + 33 : 32).4 - 3 = (7 + 27 : 9).4 - 3
= (7 + 3).4 - 3
= 10.4 - 3
= 40 - 3
= 37
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. (24 + 32) - 2560] : 72} = 168 + {[2. (16 + 9) - 1] : 49}
= 168 + {[2. 25 - 1] : 49}
= 168 + {[50 - 1] : 49}
= 168 + {49 : 49}
= 168 + 1
= 169