` a) ` ` 120-[ 100:( 2^3 -4)] `
` = 120-( 100:4) `
` = 120-25 `
` = 95 `
` b) ` ` 3^3 : 3^2 +2^3 . 2^2 `
` = 3 + 2^5 `
` = 3 + 32 `
` = 35 `
` c) ` ` 100: {250 :[450-(4 . 5^3 - 2^2 . 25 )]} `
` = 100: [ 250:( 450-400)] `
` = 100: ( 250:50) `
` = 100:5 `
` = 20 `
` d) ` ` 30.{175 :[355-(135+ 37.5)]} `
` = 30.[ 175:( 355-320)] `
` = 30.(175:25) `
` = 30.7 `
` = 210 `
` e) ` ` 2.( 4^2 - 9)+3^2.( 15-10) `
` = 2.7+3^2 . 5 `
` = 14 + 9. 5 `
` = 14 + 45 `
` = 59 `
` f) ` ` 500-{ 5.[409-(2^3 .3 - 21) . 2 ] + 10^3 } :15 `
` = 500-[ 5.(409-3)+10^3]:15 `
` = 500-( 2030+10^3):15 `
` = 500-202 `
` = 298 `