c ) 815 - 23 - 77 + 185 

= ( 815 + 185 ) - ( 23 + 77 )

= 1000 - 100 = 900

m ) 8 x 427 x 3 + 6 x 573 x 4

= 24 x 427 + 24 x 573

= 24 x ( 427 + 573 ) 

= 24 x 1000

= 24000

g ) 52 - 42 + 37 + 28 - 38 + 63

= ( 52 + 28 ) - ( 42 + 38 ) + ( 37 + 63 )

= 80 - 80 + 100

= 0 + 100

= 100

h ) 35 x 18 - 9 x 70 + 100

= 7 x 5 x 9 x 2 - 9 x 7 x 5 x 2 + 100

= 0 + 100

= 100

n ) 2008 x 867 + 2009 x 133

= 2008 x 867 + ( 2008 + 1 ) x 133

= 2008 x 867 + 2008 x 133 + 133

= 2008 x ( 867 + 133 ) + 133

= 2008 x 1000 + 133

= 2008000 + 133

= 2008133

i ) 326 x 78 + 327 x 22

= 326 x 78 + ( 326 + 1 ) x 22

= 326 x 78 + 326 x 22 + 22

= 326 x ( 78 + 22 )  + 22

= 326 x 100 + 22

= 32600 +22

= 32622

q ) ( 20 + 21 + 22 + 23 + 24 + 25 ) x ( 16 - 2 x 8 ) 

= ( 20 + 21 + 22 + 23 + 24 + 25 ) x ( 16 - 16) 

= ( 20 + 21 + 22 + 23 + 24 + 25 ) x 0

= 0

thank bạn

=3381x3+6x573x4

=10143+6x573x4

=10143+3432x4

=10143+13728

=23871

Lưu ý:Phải làm nhân chia trước,cộng trừ sau.

=24x427+24x573

=24x(427+573)

=24x1000

=24000

đây là cách tính nhanh bạn nha! nếu tính bình thường thì như bạn kia

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

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

$=24\times (427+563)$

$=24\times 1000$

$=24000$

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

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

$=24\times (427+563)$

$=24\times 1000$

$=24000$

= 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

\(a,8\times427\times3+6\times573\times4\)

\(=24\times427+24\times573\)

\(=24\times\left(427+573\right)\)

\(=24\times1000\)

\(=24000\)

\(b,6\times1235\times20-5\times235\times24\)

\(=120\times1235-120\times235\)

\(=120\times\left(1235-235\right)\)

\(=1235\times1000\)

\(=1235000\)

a: =24x427+24x573

=24000

\(8\cdot427\cdot3+6\cdot573+46\cdot1235\cdot20-5\cdot235\cdot24\)

\(=4\cdot2\cdot427\cdot3+6\cdot573+23\cdot2\cdot1235\cdot20-5\cdot235\cdot4\cdot3\cdot2\)

\(=4\cdot427\cdot6+6\cdot573+23\cdot2\cdot247\cdot5\cdot20-20\cdot5\cdot47\cdot3\cdot2\)

\(=6\cdot\left(4\cdot427+573\right)+23\cdot247\cdot200-47\cdot3\cdot200\)

\(=6\cdot\left(1708+573\right)+23\cdot\left(200+47\right)\cdot200-47\cdot3\cdot200\)

\(=6\cdot2281+23\cdot200\cdot200+23\cdot47\cdot200-47\cdot3\cdot200\)

\(=13686+23\cdot40000+20\cdot200\cdot47\)

\(=13686+920000+4000\cdot47\)

\(=13686+920000+188000\)

\(=13686+\left(920000+188000\right)\)

\(=13686+1108000=1121686\)

trời ơi là trời

làm đúng mà dis

mệt quá là mệt

thằng mô dis tui hử khai mau

tui dis hết luôn cho mà coi

trl sẽ có like

a=8x3x6x4x(427+573)

a=8x3x6x4x1000

a=576000

a) \(30\times1235\times4-8\times235\times15\)

\(=120\times1235-120\times235\)

\(=120\times\left(1235-235\right)\)

\(=120\times1000\)

\(=120000\)

b) \(\left(120\times99+120\right)-185\times101+185\)

\(=120\times\left(99+1\right)-185\cdot\left(101-1\right)\)

\(=120\times100-185\times100\)

\(=12000-18500\)

\(=-6500\)

a) 30 x 1235 x 4 - 8 x 235 x 15

=(30x4) x 1235 - (8x15)x235

= 120 x 1235 - 120 x 235

=120 x (1235-235)

=120 x 1000

=120000

b) ( 120 x 99 +120)  - 185 x 101-185

=(120 x 99 + 120) - (185x101+185)

=120x(99+1) - 185x(101+1)

=120 x 100-185x102

=12000-18870

= -(18870-12000)

= -6870