\(1234 + 678 + 766 + 1322=(1234+766)+(678+1322)=2000+2000=4000\)

\(427\times42+427\times35+427\times23=427\times\left(42+35+23\right)=427\times100=42700\)

\(248\times125-248\times24-248=248\times\left(125-24-1\right)=248\times100=24800\)

X : 427 = X

X : X = 427

1 = 427 ( vô lí )

\(\Rightarrow\)X = 0

X:427=X

=>X=427.X

=>X=0

427 : X = X 

427 = X²

=> X = \(\sqrt{427}\)

427:X=X 

=> \(x^2=427\)

=> x = 20,66397832 

Thay vào ta có : 427 : 20,66397832  = 20,66397832  

a) x + 216 = 570

x = 570 – 216

x = 354

b) x – 129 = 427

x = 427 + 129

x = 556

=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

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

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

$=24\times (427+563)$

$=24\times 1000$

$=24000$

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

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

$=24\times (427+563)$

$=24\times 1000$

$=24000$

 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

= 24 x 427 + 24 x 573

= 24 x (427 + 573)

= 24 x 1000

= 24000

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

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

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

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

\(=24\times1000\)

\(=24000\)

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

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

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

\(=1235\times1000\)

\(=1235000\)

a: =24x427+24x573

=24000