Bài 2 : Bỏ 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 )]
Giúp mình vớiiiiiiiiiii
tham khảo
1/ -7264 + (1543 + 7264)
= -7264 + 7264 + 1543
= 0 + 1543 = 1543
2/ (144 - 97) - 144
= 144 - 144 - 97
= 0 - 97 = -97
3/ -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
= 28
6/ (36 + 79) + (145 - 79 - 36)
= 36 + 79 + 145 - 79 - 36
= 36 - 36 + 79 - 79 + 145
= 145
7/ 10 - [12 - (-9 - 1)]
= 10 - (12 + 9 + 1)
= 10 - (12 + 10)
= 10 - 10 - 12
= -12
8/ (38 - 29 + 43) - (43 + 38)
= 38 - 29 + 43 - 43 - 38
= 38 - 38 + 43 - 43 - 29
= -29
9/ 271 - [(-43) + 271 -(-17)]
= 271 - (-43 + 271 + 17)
= 271 + 43 - 271 - 17
= 43 - 17 = 26
10/ -144 - [29 - (+144) - (+144)]
= -144 - 29 + 144 + 144
= -29 + 144
= 115