Đáp án+Giải thích các bước giải:
`a,(27 + 514)-(486 - 73)`
`=27+514-486+73`
`=27+73+514-486`
`=(27+73)+(514-486)`
`=100+28`
`=128`
`b,(36 + 79)+(145 - 79 - 36)`
`=36+79+145-79-36`
`=(36-36)+(79-79)+145`
`=0+0+145`
`=145`
`c, 10 -[12-(- 9 - 1 )]`
`=10-[12+9+1]`
`=10-12-9-1`
`=(10-12)-(9+1)`
`=-2-10`
`=-12`
`d,(38 - 29 + 43)-(43 + 38)`
`=38-29+43-43-38`
`=(38-38)+(43-43)-29`
`=0+0-29`
`=-29`
`e, 271 - [(-43)+271 -(-17)]`
`=271-[-43+271+17]`
`=271+43-271-17`
`=(271-271)+(43-17)`
`=0+26`
`=26`
`g,-144 -[29-(+144)-(+144)]`
`=-144-[29-144-144]`
`=-144-29+144+144`
`=(-144+144)+(144-29)`
`=0+115`
`=115`