Giúp em với ạ . E cảm ơn nhièu ạ

Đáp án+Giải thích các bước giải:

`\bb 1)`

`3.5^2-16:2^2`

`=3.25-16:4`

`=75-4`

`=71`

$\\$

`\bb 2)`

`200:[117-(23-2.3)]`

`=200:[117-(23-6)]`

`=200:[117-17]`

`=200:100`

`=2`

$\\$

`\bb 3)`

`2^3 .17-2^3 .14`

`=8.17-8.14`

`=8.(17-14)`

`=8.3`

`=24`

$\\$

`\bb 4)`

`2020-[45-(6-1)^2]+1992^0`

`=2020-[45-5^2]+1`

`=2020-[45-25]+1`

`=2020-20+1`

`=2001`

$\\$

`\bb 5)`

`20-[30-(5-1)^2]`

`=20-[30-4^2]`

`=20-[30-16]`

`=20-14`

`=6`

$\\$

`\bb 6)`

`480:[75+(7^2-8.3):5]+2021^0`

`=480:[75+(49-24):5]+1`

`=480:[75+25:5]+1`

`=480:[75+5]+1`

`=480:80+1`

`=6+1`

`=7`

$\\$

`\bb 7)`

`8.5^2-189:3^2`

`=8.25-189:9`

`=200-21`

`=179`

$\\$

`\bb 8)`

`2^4 .5-[131-(13-4)^2]`

`=16.5-[131-9^2]`

`=80-[131-81]`

`=80-50`

`=30`