Question

Bai 1 tinh:a)-54x76+12x(-76)

       b)(37-17)x(-9)+35x(-9-11)

        c)(-25)x(75-45)-75x(45-25) 

Bai 2 bo dau ngoac

            a)24x5-[131-(13-4)x2]

             b)30x{175:[355-(135+37x5)]}

               c)160-(23x25-6x25)

Answer 1

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

Answer 2

a,-5016

b,-880

c,-2250

Answer 3

cho sorry bai mik ghi nham