a) \(980+y:94=8245\)

\(y:94=7265\)

\(y=7265\times94\)

\(y=682910\)

b) \(45\times y\times36=3240\)

\(45\times y=3240:36\)

\(45\times y=90\)

\(y=90:45\)

\(y=2\)

c) \(3865-y+875=1000\)

\(3865-y=125\)

\(y=3865-125\)

\(y=3740\)

d) \(4788:126\times y=1596\)

\(126\times y=4788:1596\)

\(126\times y=3\)

\(y=\dfrac{3}{126}\)

\(y=\dfrac{1}{42}\)

e) \(24624:y:9=76\)

\(y:9=24624:76\)

\(y:9=324\)

\(y=324\times9\)

\(y=2916\)

\(a)15.\left(\dfrac{212121}{434343}+\dfrac{333333}{353535}\right)\)

\(=15.\left(\dfrac{21}{43}+\dfrac{33}{35}\right)\)

\(=15.\dfrac{2154}{1505}\)

\(=\dfrac{6462}{301}\)

1 a/ B = 2016 . 2016 - 2014 . 2018

           =\(2016^2-\left(2016-2\right).\left(2016+2\right)\)

           = \(2016^2-2016.\left(-2+2\right)\\\)

           =\(2016^2-2016.0 \)

           = \(2016^2\)

1: Tính
a) B = 2016 x 2016 - 2014 x 2018
       = (2016 x 2016) - (2014 x 2018)
       =  4064256 - 4064252
       = 4
       b) 327 x 412 + 400 / 328 x 412 -12
          = (327 x 412 + 400) / ( 328 x 412 - 12)
           = 135124 / 135124
           = 1

c) ( 1234 x 567 - 667 ) : ( 567 + 1234 x 5)
   = (1234 x 567 - 667) : (567 + 1234 x 566) 
= [1234 x 566 + (1234 - 667)] / (1234 x 566 + 567) 
= (1234 x 566 + 567) / (1234 x 566 + 567)
= 1
để thiếu bạn ơi
 

x-125=412

=>x=412+125

=>x=537

`x - 125 = 412`

`x = 412 + 125`

`x = 537`

Vậy `x = 537`

x - 125 = 412

x= 412 + 125

x= 537.

a

A

y x ( 98 + 2) = 412

y x 100 = 412

y = 412 : 100

y = 4,12

Chọn A

4^12-x = 16

4^12-x = 4²

12 - x = 2

       x = 12 - 2

       x = 10

4¹²-x=16

4¹²-x= 4²

12-x=2

x=12-2

x=10

sửa lại nhé:x=4¹⁰

a.\(\frac{327.412+400}{328.412-12}=\frac{327.412+400}{\left(327+1\right).412-12}=\frac{327.412+400}{327.412+412-12}=\frac{327.412+400}{327.412+400}=1\)

b.\(\frac{1234.567-667}{1234.566+567}=\frac{1234.\left(566+1\right)-667}{1234.566+567}=\frac{1234.566+1234-667}{1234.566+567}=\frac{1234.566+567}{1234.566+567}=1\)

X x 3,5 = 454 - 412

X x 3,5 = 42

x          = 42 : 3,5

x          = 12  

x*3.5+412=454

x*3.5=454-412

x*3.5=42

x= 42:3.5

x=12

k mk nha mn 

X x 3,5 + 412=454

X x 3,5 = 454 - 412

X x 3,5= 42

x= 42 : 3,5

x= 12

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