Bài 1 : bỏ dấu ngoặc rồi tính.
1, -7264+(1543+7264)
2, ( 144-97) - 144
3, ( -145) - ( 18- 145)
4, 111+ ( -11+27)
5, ( 27+ 514) -( 486-73)
6, ( 36 + 79) + ( 145-79-36)
7, 10-[12-(- 9-1)]
8, ( 38-29+43) -( 43+38)
9, 271-[(-43)+271-(-17)]
10, -144-[29-(+144)-(+144)]
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Bài 1 : bỏ dấu ngoặc rồi tính.
1, -7264+(1543+7264)
\(=-7264+1543+7264\)
\(=-8807+7264\)
\(=-1543\)
2, ( 144-97) - 144
\(=144-97-144\)
\(=47-144\)
\(=-97\)
3, ( -145) - ( 18- 145)
\(=-145-18+145\)
\(=-163+145\)
\(=18\)
4, 111+ ( -11+27)
\(=111+\left(-11\right)+27\)
\(=100+27\)
\(=127\)
5, ( 27+ 514) -( 486-73)
\(=27+514-486+73\)
\(=541-486+73\)
\(=55+73\)
\(=128\)
6, ( 36 + 79) + ( 145-79-36)
\(=36+79+145-79-36\)
\(=115+145-79-36\)
\(=260-79-36\)
\(=145\)
7, 10-[12-(- 9-1)]
\(=10-12+9+1\)
\(=8\)
8, ( 38-29+43) -( 43+38)
\(=38-29+43-43-38\)
\(=-29\)
9, 271-[(-43)+271-(-17)]
\(=271+43-271+17\)
\(=60\)
10, -144-[29-(+144)-(+144)]
\(=-144-29-144-144\)
\(=-461\)
