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

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

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

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

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

\(=100:5\)

\(=20\)

$100:\left\{250:\left[450-\left(4\cdot 5^3-2^2\cdot 25\right)\right]\right\}$

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

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

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

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

$=100:5$

$=20$

3².22-3².19

=3².(22-19)

=9.2

=18

Mik làm 1 câu thôi sức ko

\(2^3.15-\left[115-\left(12-5\right)^2\right]=8.15-\left[115-7^2\right]=120-\left[115-49\right]=120-66=54\)

\(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}=100:\left\{250:\left[450-\left(4.125-4.25\right)\right]\right\}=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)

\(=100:\left[250:\left(450-400\right)\right]=100:\left(250:50\right)=100:5=20\)

\(=600:\left\{450:\left[450-\left(500-200\right)\right]\right\}\)

\(=600:\left\{450:\left[450-300\right]\right\}\)

\(=600:3=200\)

=600:{450:[450-(4.125-8.25)]}

=600:{450:[450-(8.125-4.25)]}

=600:{450:[450-300]

=600:{450:150}

=600:3

=200

Lần sau bn nhớ ghi đúng thứ tự ngoặc nhé

a,  600 : { 450 : 450 - 4 . 5 3 - 2 3 . 5 2 }

= 600:{450:[450 - (4.125 - 8.25)]} = 600:{450:[450 - (500 - 200)]}

= 600:{450:[450 - 300]} = 600:{450:150} = 600:3 = 200

b,  18 . { 420 : 6 - 150 - ( 68 . 2 - 2 3 . 5 ) }

= 18.{70 - [150 - (68.2 - 8.5)]} = 18.{70 - [150 - (136 - 40)]}

= 18.{70 - [150 - 96]} = 18.{70 - 54} = 18.16 = 288

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

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

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

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

=100:{250:50}

=100:5

=20