Question

cac ban giup minh cau nay nhe 

bai 1 pha ngoac roi tinh

a)  - { -12 - [ 28 + ( -23 ) ] - ( - 105 ) } 

b)  - ( 125 - 37 ) + [ -28 - ( 31 - 105 ) ]

 

 

Answer 1

Answer 2

a.ta có : -{- 12-[28 +(-23)] - (-105) }=-{-12-28+23 +105}=12+28-23-105=-88

b.ta có : -(125-37)+[-28-(31-105)]=-125+37+[-28-31+105]=-125+37-28-31+105=-42

Answer 3

a)  -{ -12 - [ 28 + ( -23 ) ] - ( -105 ) }

= - { -12 - [ 28 -23 ] +105 }

= - { -12 - 28 + 23 + 105 }

= 12 +28 -23 -105 

= -88

b) - ( 125 - 37 ) + [ -28 - ( 31 - 105 ) ]

= - 125 + 37 + [ -28 -31 + 105 ]

= - 125 + 37 - 28 - 31 + 105

= - 42

Answer 4

a) Ta có: - { -12 - [ 28 + ( -23 ) ] - ( -105) ] } = 12 + [ 28 - 23 ]  - 105 

= 12 + 5 - 105

= 17 - 105

= - 88

b) Ta có: - ( 125 - 37 ) + [ - 28 - ( 31 - 105 ) ] = -125 + 37 - 28 - 31 + 105

= -88 - 28 - 31 + 105

= -116 - 31 + 105

= -147 + 105

= -42

Chuk bn hok tốt !