2 x 53 x 12 + 4 x 6 x 87 -  3 x 8 x 40

= 2 x 12 x 53 + 4 x 6 x 87 - 3 x 8 x 40

= 24 x 53 + 24 x 87 - 24 x 40

= 24 x (53 + 87 - 40)

= 24 x (140 - 40)

= 24 x 100

= 2400

Ủng hộ mk nha ^_-

2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40

= 24 x 53 + 24 x 87 - 24 x 40

= 24 x ( 53 + 87 - 40 )

= 24 x 100

= 2400

2400 là kết quả đúng

2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40

= 1272 + 2088 - 960

= 3360 - 960

= 2400

2.53.12 + 4.6.87 - 3.8.40

= 24.53 + 24.87 - 24.40

= 24.(53+87-40)

= 24.100

= 2400

minh cun g vua lam xong co giao cham dung do 

2.53.12+4.6.87-3.8.40=2400

2 . 53 .12 + 4 . 6 . 87 - 3 . 8 . 40

= 24 . 53 + 24 . 87 - 24 . 40

= 24 . (53 + 87 - 40)

= 24 . 100

= 2400

  2  x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40

=(2 x 12) x 53 + (4 x 6) x 87 - (3 x 8) x 40

=24 x 53 + 24 x 87 - 24 x 40

=24 x (53 + 87 - 40)

=24 x 100

=2400

**** cho mình nha

b) 2 . 53 . 12 + 4 . 6 . 87 - 3 . 8 . 40

= 2 . 12 . 53 + 4 . 6 . 87 + 3 . 8 . 40

= 24 . 53 + 24 . 87 + 24 . 40

= 24 . ( 53 + 87 - 40 )

= 24 . 100

= 2400

53x39+47x39-53x21-47x21

=39x ( 53+47) - 21x(53+47)

=39 x100 - 21x100

= 100x(39-21)

=100x18

=1800

2x53x12 +4x6x87 - 3x8x40

= (2x12)x53 + (4x16)x87 - (3x8) x40

= 24x53 + 24x87 + 24x40

= 24( 53+87+40)

= 24x180

=4320

phần thứ hai sai r

Khiếp

2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40 
= 2. 53 . 9 . 3 + 2. 3 .9 .87 - 3 .2 .9 .40
= 54.53+54.87-54.40
=54(53+87-40)
=54. 100=5400

12 . 25 + 29 . 25 + 59 . 25 
= 25 . ( 12+29+59)
=25 . 90
=2250

43 . 37 + 93 . 43 + 57 . 61 + 69 . 57 
= 43.(37+93)+57(61+69)
=43.130+57.130
=130.(43+57)
=130.100
=13 000

12 . 53 + 53 . 172 - 53 
=53(12+172-1)
=53.184
=9752

35 . 54 + 35 . 58 + 65 . 75 + 65 . 45 
=35(54+58)+65(75+45)
=35.112+65.120
=3920+7800
=11720

39 . 8 + 70 . 3 + 31 . 8 
=8(39+31)+70.3
=8.70+70.3
=70.(8+3)
=70.11
=770