1000

\(450+250=700\)

cô ơi

c

A

\(\left(250-25\right):5:y=\left(450-60\right):130\)

\(\Leftrightarrow\)\(45:y=3\)

\(\Leftrightarrow\)\(y=45:3\)

\(\Leftrightarrow\)\(y=15\)

Chúc bạn học tốt ^^

\(=100:\left[250-450+4\cdot125-8\cdot25\right]\\ =100:\left[-250+500-200\right]=100:50=2\)

Học sinh nhẩm và ghi kết quả như sau:

310 + 40=350

150 + 250 =400

450 – 150= 300

\(=100:\left\{250\left[450-\left(4\cdot125-4\cdot25\right)\right]\right\}\\ =100:\left[250\left(450-400\right)\right]\\ =100:\left(250\cdot50\right)=100:12500=12,5\)

100 : { 250 [ 450 - ( 4.5^3 - 2^2 .25) ]} = 12,5

=100:{250.[450-(4.125-4.25)]}

=100:{250:[450-400]}

=100:{250:50}

=100:5

=20

{(250-25):15}:x=(450-60):130

{    225 : 15 } : x =    390 : 130

           15       : x =         3

                        x =         15 : 3

                       x =                5

Ủng hộ mk nhé

=>9225:15):x=390:130

=>15:x=3

=>x=15:3

=>x=5

chúc bn hok tốt nha

<=>[(250-25):15]:x=3

<=>225:15:x=3

<=>15:x=3

 =>x      =15:3

 =>     x =5

( 225 : 15 ) : x = 390 = 130

15             : x = 390 = 130

...........mk thấy đề bài sai bạn ạ

[(250 - 25 ) : 15 ] : x =130

[225 : 15 ] : x = 130

15 : x =130

x =15 : 130 

x = 3 /26

\(100:\left\{250:\left[450-\left(4\cdot5^3-2^2\cdot25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(4\cdot125-4\cdot25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)

\(=100:\left[250:\left(450-400\right)\right]\)

\(=100:\left(250:50\right)\)

\(=100:5\)

\(=20\)

100:{250:[450−(4⋅53−22⋅25)]}

$=100:\left\{250:\left[450-\left(4\cdot 125-4\cdot 25\right)\right]\right\}$

$=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}$

$=100:\left[250:\left(450-400\right)\right]$

$=100:\left(250:50\right)$

$=100:5$

$=20$