Tham khảo : 

\(272+\left(146-x\right)=118\)

\(146-x=118-272\)

\(146-x=-154\)

\(x=146-\left(-154\right)\)

\(\Rightarrow x=300\)

\(504:\left(16-3x\right)=72\)

\(16-3x=504:72\)

\(16-3x=7\)

\(3x=16-7\)

\(3x=9\)

\(x=9:3\)

\(\Rightarrow x=3\)

1=> 146-x=-154

=>x=300

2> =>16-3x=7

=>3x=9

=>x=3

a, 272 + ( 146 - x ) = 118

146 - x = 118 - 272

146 - x = -154

x = 146 - ( -154 )

x = 300

Vậy....

b, 504 : ( 16 - 3x ) = 72 

16 - 3x = 7

3x = 16 - 7 

3x = 9

x = 3

Vậy.....

\(\frac{x}{-4}=\frac{-16}{x}\)

\(\Rightarrow x\cdot x=-16\cdot\left(-4\right)\)

\(\Rightarrow x^2=64\)

\(\Rightarrow x^2=\left(\pm8\right)^2\)

\(\Rightarrow x=\pm8\)

a)\(\left(x-\frac{5}{8}\right).\frac{5}{18}=-\frac{15}{36}\)

\(\Rightarrow x-\frac{5}{8}=\frac{-15}{36}.\frac{18}{5}\)

\(\Rightarrow x-\frac{5}{8}=-\frac{3}{2}\)

\(\Rightarrow x=-\frac{12}{8}+\frac{5}{8}=-\frac{7}{8}\)

b)\(\frac{x}{-4}=\frac{-16}{x}\)

\(\Rightarrow x^2=64\)

\(\Rightarrow x=\orbr{\begin{cases}8\\-8\end{cases}}\)

\(\left(x-\frac{5}{8}\right)\frac{5}{18}=-\frac{15}{36}\)

\(\Leftrightarrow\frac{5}{18}x-\frac{25}{144}=-\frac{15}{36}\)

\(\Leftrightarrow\frac{5}{18}x=-\frac{35}{144}\)

\(\Leftrightarrow x=-\frac{7}{8}\)

2:

a: \(2^2\cdot3-4=4\cdot3-4=12-4=8\)

b: \(16-2^3\cdot2=16-2^4=16-16=0\)

c: \(4^2-4\cdot2=16-8=8\)

d: \(3^3-2\cdot3^2=27-2\cdot9=27-18=9\)

e: \(7^2-9\cdot2^2=49-9\cdot4=49-36=13\)

f: \(2^2\cdot3+4^2=4\cdot3+16=12+16=28\)

Bài 1:

a: \(13+21\cdot5-\left(198:11-8\right)\)

\(=13+105-18+8\)

=21+87

=108

b: \(272:16-5+4\cdot\left(30-5-255:17\right)\)

\(=17-5+4\cdot\left(30-5-15\right)\)

\(=12+4\cdot10=12+40=52\)

c: \(15\cdot24-14\cdot5\cdot\left(145:5-27\right)\)

\(=360-70\left(29-27\right)\)

=360-140

=220

d: \(18\cdot3-18\cdot2+3\cdot\left(\dfrac{51}{17}\right)\)

\(=18\left(3-2\right)+3\cdot3\)

=18+9

=27

e: \(64+115+36-25\cdot8\cdot6\cdot2^2\cdot3+4^2\)

\(=100+115-200\cdot6\cdot4\cdot3+16\)

\(=231-14400=-14169\)

f: \(15\cdot8-\left(17-30+83\right)-144:6\)

\(=120-24-\left(100-30\right)\)

=96-70

=26

315 +  ( 146 - x ) = 401

         146 - x       = 401 - 315

              146 - x = 86

                      x = 146 - 86

                     x  = 60

x - 36 : 18 = 12

  x - 2       = 12

          x   = 12 + 2

         x    = 14

( x - 36 ) : 18 = 12

x - 36           = 216

              x    = 216 + 36

              x   = 252

**** cho mình nha! Cảm ơn bạn!

315+(146-x)=401

     146 - x  =401-315

      146-x   = 86

      x         =146-86

         x      =60

x-36:18=12

x - 2    =12

   x      =12-2

   x      =10

 (x-36):18=12

  x-36     =12x18

  x-36     =216

   x         =216-36

    x        = 180

315 + ( 146 - x ) = 401

146 - x=401-315

146 - x=86

x=146-86

x=60

x - 36 : 18 = 12 

x-2=12

x=12+2

x=14

( x - 36 ) : 18 = 12

x-36=12x18

x-36=216

x=216+36

x=252

`a, 504 : (16-3x)=72`

`<=> 16-3x=7`

`<=>3x=9`

`<=>x=3`

`b,272-(4x+15)=45`

`<=>4x+15=227`

`<=>4x=212`

`<=>x=53`

a: =>16-3x=504:72=7

=>3x=9

=>x=3

b: =>4x+15=272-45=227

=>4x=212

=>x=53

a) 504 : (16 - 3\(\times\)x) = 72

=> 16 - 3\(\times\)x = 7

=> 3\(\times\)x = 9

=> x = 3

d) 272 - (4\(\times\)x + 15) = 45

=> 4\(\times\)x + 15 = 227

=> 4\(\times\)x = 212

=> x = 53

 36-4x9 = 36 - 36 = 0 Vì số nào nhân với 0 thì cũng bằng 0 nên phép tính đó bằng 0

ai trả lời câu hỏi gifm tôi đi mà :'(

b/ =-36.16+36.41-16.41+16.36

=36.41-16.41

=41.(36-16)

=41.20

=820

Bài 6 : Tìm x
a) x – 36 : 18 = 12 – 15

<=> x-2=-3

<=>x=-3+2

<=>x=-1

Vậy x=-1

b, 16.4x=48

<=>64x=48

<=>x=48/64

<=>x=0,75

Vậy x=0,75

A) 18 x ( 16 - 16 ) = 0

= 18 x 0

= 0

B)  ( x -15) x 72 =0

( x -15)              = 0:72

( x -15)              = 0

x                        = 0+15

x                        = 15