a) 135 x (20 + 3)

= 135 x 20 + 135 x 3

= 2700 + 405 = 3105

427 x (10 + 8)

= 427 x 10 + 427 x 8

= 4270 + 3416 = 7686

b) 642 x (30 -6)

= 642 x 30 - 642 x 6

= 19260 - 3852 = 15408

287 x (40 -8)

= 287 x 40 - 287 x 8

= 11480 - 2296 = 9184

135 x ( 20 + 3 ) = 135 x 23 = 3105

427 x ( 10 + 8 ) = 427 x 18 = 7686

642 x ( 30 - 6 ) = 642 x 24 = 15408

287 x ( 40 - 8 ) = 287 x 32 = 9184

$8\times 427\times 3+6\times 563\times 4$

$=24\times 427+24\times 563$

$=24\times (427+563)$

$=24\times 1000$

$=24000$

$8\times 427\times 3+6\times 563\times 4$

$=24\times 427+24\times 563$

$=24\times (427+563)$

$=24\times 1000$

$=24000$

= 24 x 427 + 24 x 573

= 24 x (427 + 573)

= 24 x 1000

= 24000

\(=\left(8\times3\right)\times427+\left(6\times4\right)\times573\\ =24\times427+24\times573\\ =24\times\left(427+573\right)\\ =24\times1000\\ =24000\)

 8 x 427 x 3 + 6 x 573 x 4

= 8 x 3 x 427 + 6 x 4 x 573

= 24 x 427 + 24 x 573

= 24 x (427 + 573)

= 24 x 1000

= 24000

 2008 x 867 + 2009 x 133

= 2008 x 867 + 2008 x 133 + 133

= 2008 x (867 + 133) + 133

= 2008 x 1000 + 133

= 2008133

tick cho mink nhé

135 x (20 + 3)

= 135 x 20 + 135 x 3

= 2700 + 405

= 3105.

427 x (10 + 8)

= 427 x 10 + 427 x 8 

= 4270 + 3416

= 7686.

642 x (30 - 6)

= 642 x 30 - 642 x 6

= 19260 - 1452

= 18808.

287 x (40 - 8)

= 287 x 40 - 287 x 8

= 11480 - 2296

= 9184.

135x(20+3)                                                 642 x (30-6)

= 135 x 20 + 135 x 3                                 = 642 x 30 - 642 x 6

=  2700+405                                             =  19 260 -  3852

= 3105                                                       =15 408

427 x ( 10+8)                                  287 x (40 - 8)

= 427 x 10 + 427 x 8                       = 287 x 40 - 287 x 8

= 4270 + 3416                                 =11 480 - 2296

=7686                                              = 9184

a: (-17)+5+8+17

\(=\left(-17+17\right)+\left(5+8\right)\)

=0+13

=13

b: \(\left(-24\right)+6+10+24\)

\(=\left(-24+24\right)+\left(6+10\right)\)

=0+16

=16

c: \(\left(-24\right)+6+\left(-10\right)+24\)

\(=\left(-24+24\right)+\left(6-10\right)\)

=0+(-4)

=-4

d: \(\left(-456\right)+2021-544\)

\(=2021-\left(456+544\right)\)

=2021-1000

=1021

e: \(\left(-1075\right)-29-\left(-1075\right)\)

\(=-1075+1075-29\)

=0-29

=-29

f: \(\left(-135\right)+48+140-\left(-5\right)\)

\(=48+\left(-135+140+5\right)\)

=48+10

=58

g: \(329+64+\left(-394\right)+36\)

\(=\left(329-394\right)+\left(64+36\right)\)

=100-65

=35

h: \(\left(-427\right)+\left(-123\right)+23+27\)

\(=\left(-427+27\right)+\left(-123+23\right)\)

=-400-100

=-500

trl sẽ có like

a=8x3x6x4x(427+573)

a=8x3x6x4x1000

a=576000