cứu vs ạ..............................mong add ko xóa phần 2

Đáp án `+` Giải thích các bước giải:

`2)`

`4.3+[8-(2+3)]`

`=12+[8-5]`

`=12+3`

`=15`

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`4)`

`2.{19+[12:(8-4)]+5}`

`=2.{19+[12:4]+5]}`

`=2.{19+3+5}`

`=2.27`

`=54`

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`6)`

`40:{5.[10-(6+3)]}`

`=40:{5.[10-9]}`

`=40:{5.1}`

`=40:5`

`=8`

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`8)`

`3.[(15.2):(5+5.2)]`

`=3.[30:(5+10)]`

`=3.[30:15]`

`=3.2`

`=6`

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`10)`

`15-{15:[6-(1+2)]}`

`=15-{15:[6-3]}`

`=15-{15:3}`

`=15-5`

`=10`