a) 295 - (31 - 2² . 5)²
= 295 - (31 - 4 . 5)²
= 295 - (31 - 20)²
= 295 - 11²
= 295 - 121
= 174
b) 12000 : {5[409 - (18 - 9)] + 1000}
= 12000 : [5(409 - 9) + 1000]
= 12000 : (5 . 400 + 1000)
= 12000 : (2000 + 1000)
= 12000 : 3000
= 4
a) 295 - (31 - 2² . 5)²
= 295 - (31 - 4 . 5)²
= 295 - (31 - 20)²
= 295 - 11²
= 295 - 121
= 174
b) 12000 : {5[409 - (18 - 9)] + 1000}
= 12000 : [5(409 - 9) + 1000]
= 12000 : (5 . 400 + 1000)
= 12000 : (2000 + 1000)
= 12000 : 3000
= 4
