a) = 8 . 15 - [115- 7² ]

     = 8 . 15 - [115- 49 ]

     = 120    - 56

      = 64

b) = 100 : {250 : [450 - (2.125 - 8.25)]}

    = 100 : {250 : [450 - (250 - 200 )]}

     = 100 : {250 : [450 - 50]}

     = 100 : {250 :400}

     = 100 : 0,265

      = 0,00265

     = 

\(a,2^3.15-\left[115-\left(12-5\right)^2\right]\)

\(=8.15-\left[115-\left(12-5\right)^2\right]\)

\(=120-\left[115-7^2\right]\)

\(=120-\left[115-49\right]\)

\(=120-66\)

\(=54\)

\(b,100:\left\{250:\left[450-\left(2.5^3-2^3.25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(2.125-8.25\right)\right]\right\}\)

\(=100:\left\{250:\left[450-\left(250-200\right)\right]\right\}\)

\(=100:\left\{250:\left[450-50\right]\right\}\)

\(=100:\left\{250:400\right\}\)

\(=100:0,625\)

\(=160\)

a: \(25\cdot2^3-\left\lbrack164-\left(12-4\right)^2\right\rbrack+10\cdot2018\)

\(=25\cdot8-\left\lbrack164-8^2\right\rbrack+10\cdot2018\)

=200-(164-64)+20180

=20380-100

=20280

b: \(100:\left\lbrace250:\left\lbrack450-\left(4\cdot5^3-2^2\cdot25\right)\right\rbrack\right\rbrace\)

=100:{250:[450-(4*125-4*25)]}

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

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

=100:{250:50}

=100:5

=20

Đáp Án

a)52:4x3+2x52

=13x3+2x52

=39+104

=143

b)5x42-18:32

=100-0.5625

=99.4375

của bạn nha

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

Bài 1:

a: \(250:\left\lbrack27+2^{10}:2^9-300:\left(74+1^5\right)\right\rbrack\)

\(=250:\left\lbrack27+2-300:\left(74+1\right)\right\rbrack\)

=250:(29-300:75)

=250:(29-4)

=250:25

=10

b: \(72+35:\left(-5\right)-4\cdot13\)

=72-52-35:5

=20-7

=13

Bài 2:

a: \(\left(x-5\right):41=7^{18}:\left(7^5\cdot7^{12}\right)\)

=>\(\left(x-5\right):41=7^{18}:7^{17}=7\)

=>\(x-5=41\cdot7=287\)

=>x=287+5

=>x=292

b: \(x-12x=5^1-115\)

=>-11x=5-115=-110

=>11x=110

=>x=110/11=10

lần sau viết cẩn thận hơn một xíu xiu xìu xiu nx thui là chuẩn đứa nèo chỉnh tát vỡ đôi mồm

a, 36:{336:[200–(12+8.20)]}

= 36:{336:[200–(12+160)]}

= 36:{336:[200–172]}

= 36:{336:28}

= 36:12 = 3

b, {145–[130–(246–236)]:2}.5

= {145–[130–10:2]}.5

= {145–130}.5

= 20.5 = 100

c, 100:{250:[450–(4. 5 3 – 2 2 .25]}

= 100:{250:[450–400]}

= 100:{250:50}

= 100:5 = 20

d, 798+100:[16–2.( 5 2 –22)]

= 798+100:10

= 798+10 = 808

e, (6954+1525:5+47.19).(29–58.2)

= (6954+1525:5+47.19).0 = 0

f,  2 4 .157– 2 4 .58+16

= 16.(157–58+1) = 1600

3².22-3².19

=3².(22-19)

=9.2

=18