Bài 1: Tính
a) -54 x 76 + 12 x ( -76 )
= -4104 + (-912)
= -5016
b) ( 37 - 17 ) x ( -9 ) + 35 x ( -9 - 11 )
= 20 x ( -9 ) + 35 x ( -20 )
= - 180 + ( -150 )
= -600
Bài 2: Bỏ dấu ngoặc
a) 24 x 5 - [ 131 - ( 13 - 4 ) x 2 ]
= 24 x 5 - [ 131 - 9 x 2 ]
= 24 x 5 - [ 131 - 18 ]
= 24 x 5 - 113
= 120 - 113
= 7
b) 30 x { 175 : [ 355 - ( 135 + 37 x 5 )]}
= 30 x { 175 : [ 355 - ( 135 + 185 )]}
= 30 x { 175 : [ 355 - 320 ]}
= 30 x { 175 : 35 }
= 30 x 5
= 600
c) 160 - ( 23 x 25 - 6 x 25 )
= 160 - ( 575 - 150)
= 160 - 425
= -265
a,-5016
b,-880
c,-2250
cho sorry bai mik ghi nham