Giúp 5 câu vs đi hlepppppp

`color{Cyan}{#Cloudy}`

`20-(30-(6-1)^2)`

`=20-(30-5^2)`

`=20-(30-25)`

`=20-5`

`=15`

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`15^2 -2(81-(3+4)^2)`

`=225-2(81-7^2)`

`=225-2(81-49)`

`=225-2xx32`

`=161`

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`2^3xx15-(115-(12-5)^2)`

`=8xx15-(115-7^2)`

`=120-(115-49)`

`=120-66`

`=54`

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`129-5xx[29-(61-100)^2]`

`=129-5xx(29-(-39^2)`

`=129-5xx(29+78)`

`=129-5xx107`

`=129-535`

`=-406`

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`60:(20-(30-(54)^2)`

`=60:(20-(30-2916)`

`=60:(20-(-2886))`

`=60:(20+2886)`

`=60:2906`