1A:

a) ` 2^2 . 3^2 - 2.3.5 `

` = 4.9-30 `

` = 36-30 `

` = 6 `

b) `2.5^2+20:2^2`

`=2.25+20:4`

`=50+5`

`=55`

c) `7^2.15-5.7^2`

`=7^2.(15-5)`

`=49.10`

`=490`

d) `5^6:5^4+3.3^2 -2021^0`

`=5^2+3^3-1`

`=25+27-1`

`=51`

1B:

a) `5^3:5^2+2^2.3`

`=5^1+4.3`

`=5+12`

`=17`

b) `4^3.125-125:5^2`

`=64.125-5^3:5^2`

`=8000-5`

`=7995`

c) `6^2.28+72.6^2`

`=6^2.(28+72)`

`=36.100`

`=3600`

d) `3.5^2+15.262-1^2.3`

`=3.25+15.4-1.3`

`=75+60-3`

`=132`

2A:

a) `A={132-[116-(16-8)]:2}.5`

`A={132-[116-8]:2}.5`

`A={132-108:2}.5`

`A={132-54}.5`

`A=78.5`

`A=390`

Vậy `A=390`

b) `B=36:{336:[200-(12+8.20)]}`

`B=36:{336:[200-(12+160)]}`

`B=36:{336:[200-172]}`

`B=36:{336:28}`

`B=36:12`

`B=3`

Vậy `B=3`

c) `C=55-[49-((2^3).17-(2^3).14)]`

`C=55-{49-[2^3.(17-14)]}`

`C=55-{49-[8.3]}`

`C=55-{49-24}`

`C=55-25`

`C=30`

Vậy `C=30`