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 + 4x 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

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

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

  2x53x12+4x6x87-3x8x40

=2x12x53+4x6x87-24x40

=24x(53+87-40)

=24x100

=2400

K cho Mk nhe!!!

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 

1+1 = ?

ai nhanh mình k

2400 là kết quả đúng

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

= 1272 + 2088 - 960

= 2400

mình nhé! Mình nhanh nhất

\(2\times53\times12+4\times6\times87-3\times8\times40\)

\(=24\times53+24\times87-24\times40\)

\(=24\times\left(53+87-40\right)=24\times100=2400\)

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

a,53*39+47*39-53*21-47*21

=39*[53+47]-21*[53+47]

=39*100-21*100

=3900-2100

=1800

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