a: \(\left[600-\left(40:2^3+3\cdot5^3\right)\right]:5\)

\(=\left[600-5-375\right]:5\)

\(=44\)

b: \(16\cdot12^2-\left(4\cdot23^2-59\cdot4\right)\)

\(=16\cdot144-4\cdot\left(23^2-59\right)\)

\(=2304-4\cdot470\)

\(=424\)

c: Ta có: \(2^{100}-\left(1+2+2^2+2^3+...+2^{99}\right)\)

\(=2^{100}-2^{100}+1\)

=1

d: Ta có: \(169\cdot2011^0-17\cdot\left(83-1702:23+1^{2012}\right)+2^7:2^4\)

\(=169-17\cdot\left(83-74+1\right)+2^3\)

\(=177-17\cdot10\)

=7

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: \(2^3\cdot15-\left[115-\left(12-5\right)^2\right]\)

\(=8\cdot15-115+7^2\)

\(=54\)

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

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

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

\(=100:\dfrac{5}{8}=160\)

Mik làm 1 câu thôi sức ko

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

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

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

a,2³ . 15 -[115-\((\)12-5)²]

= 8. 15 - [115- 7² ]

=120-[115-49]

=120-66

=54

b, 100:{250:[450-\((\)4.5³ - 2³.25)]}

=100:{250:[450-\((\)4.125-8.25)]}

=100:{250:[450-\((\)500-300)]}

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

=100:{250:250}

=100:1

=100

250 - 600 : 5 = 250 - 300 = -50

250-600:5

=250-120

=130

250-600:5

=250-120

=130

chúc bạn học tốt

Bài 1 :

a) \(...=45\left(56+44\right)-500=45.100-500=4500-500=4000\)

b) \(...=3^2.6-6^{18}+1=45+1-6^{18}=46-6^{18}\)

c) \(...=756\left(66+48-14\right)=756.100=75600\)

d) \(...=8.15-\left(149-7^2\right)=120-\left(149-49\right)=120-100=20\)

Bài 2 :

a) \(x-21=46\Rightarrow x=21+46\Rightarrow x=87\)

b) \(2^x.4=128\Rightarrow2^x=32\Rightarrow2^x=2^5\Rightarrow x=5\)

c) \(3x+27=162\Rightarrow3x=162-27\Rightarrow3x=135\Rightarrow x=45\)

d) \(4x-8=4^{2023}.4^{2021}\)

\(\Rightarrow4x-8=4^{2023+2021}\)

\(\Rightarrow4x-8=4^{4044}\)

\(\Rightarrow4x=4^{4044}+8\)

\(\Rightarrow x=\left(4^{4044}+8\right):4\)

\(\Rightarrow x=4^{4043}+2\)

Bài 3 :

Số học sinh góp 20000 đồng là :

\(35-\left(1+3\right)=31\left(hsinh\right)\)

Tổng số tiền lớp 6a ủng hộ là :

\(1.100000+3.40000+31.20000=840000\left(đồng\right)\)

Đáp số...