1) - 7264 + ( 1543 + 7264 )
= - 7264 + 1543 + 7264
= ( - 7264 + 7264 ) + 1543
= 0 + 1543
= 1543
2) ( 144 - 97 ) - 144
= 144 - 97 - 144
= ( 144 - 144 ) - 97
= 0 - 97
= - 97
3) ( - 145 ) - ( 18 - 145 )
= -145 - 18 + 145
= ( - 145 + 145 ) - 18
= 0 - 18
= - 18
4) 111 + ( - 11 + 27 )
= 111 - 11 + 27
= 100 + 27
= 127
các câu còn lại bn tự làm nha
1. -7264+(1543+7264)
=-7264+1543+7264
=[-7264+7264]+1543
=0
1,-7264+(1543+7264)=-7264+1543+7264=(-7264+7264)+1543=0+1543=1543
2,(144-97)-144=144-97-144=(144-144)-97=0-97=-97
3,(-145)-(18-145)=-145-18+145=(-145+145)-18=0-18=-18
4,111+(-11+27)=111-11+27=100+27=127
5,(27+514)-(486-73)=27+514-486+73=(27+73)+(514-486)=100+28=128
6,(36+79)+(145-79-36)=36+79+145-79-36=(36-36)+(79-79)+145=0+0+145=145
7,10-[12-(-9-1)]=10-[12+9+1]=10-12-9-1=10-10-12=0-12=-12
8,(38-29+43)-(43+38)=38-29+43-43-38=(38-38)+(43-43)-29=0+0-29=-29
9,271-[(-43)+271-(-17)]=271-[-43+271+17]=271+43-271-17=(271-271)+(43-17)=0+26=26
10,-144-[29-(+144)-(+144)]=-144-[29-144-144]=-144-[29-144-144]=-144-29+144+144=(-144+144)+(144-29)=0+115=115
1/ -7264 + ( 1543 + 7264 )
= -7264 + 8807
=1543
2/ (144 - 97 ) -144
= 47 - 144
= -97
3/ (-145)-(18-145)
=(-145)-127
=-272
4/ 111+(-11+27)
=111+16
=127
5/(27+514)-(486-73)
=541-413
=128
6/(36+79)+(145-79-36)
=115+30
=145
7/10-[12-(9-1)]
=10-[12-8]
=10-4
=6
8/(38-29+43)-(43+38)
=52-81
=-29
9/271-[(-43)+271-(-17)]
=271-245
=26
10/-144-[29-(+144)-(+144)]
=-144-(-259)
=115
mik chỉ giúp đc câu 9 thui nha
271-[ ( - 43 ) + 271 - ( - 17 ) ]
= 271 + 43 - 271 + 271 - 17
= ( 271 - 271 ) + ( 43 + 271 - 17 )
= 0 + 297
= 297
Chúc Bạn Học Tốt!! ^^
