Question

a- (7-6)^3- [4-(5^2-2^2)×7]

b- {[5^2-2^4÷8-(2-7-4÷2)]-1^8}

Answer 1

a)
= (7- 6)^3 - [4-(5^2-2^2)×7]

= 1³ - [ 4 - (25 - 4) . 7]

= 1 - [ 4 - (21) . 7]

= 1 - [ 4  - 21.7]
= 1 - [ 4 - 147]
= 1 - [ - 143]
= 1 + 143
= 144

b)
= {[5^2 - 2^4 ÷ 8 - (2 - 7 - 4 ÷ 2)]-1^8}

= {[25 - 16 : 8 - (- 5 - 2)] - 1}

= {[25 - 2 - ( - 7)] -1 }

= {[ 23 + 7] - 1}

= 30 - 1

= 29