7(x-14)+35=56

7(x-14)=21

x-14=3

x=17

7 . (x-14)+35= 25+279:9

7 . (x-14)+35= 25+31

7 . (x-14)+35= 56

7 . (x-14)= 56-35

7 . (x-14)= 21

x-14= 21:7

x-14= 3

x= 14+3

x= 17

Vậy x = 17

\(7.\left(x-14\right)+35=279:9\)

\(7.\left(x-14\right)+35=31\)

\(7.\left(x-14\right)=31-35\)

\(7.\left(x-14\right)=-4\)

\(\left(x-14\right)=-4:7\)

\(\left(x-14\right)=-\frac{4}{7}\)

\(x=-\frac{4}{7}+14\)

\(=\frac{94}{7}\)

7. (x - 14) + 35 = 279 : 9

7. (x-14) + 35 = 31

7.(x-14)      = 31-35

7. (x - 14)      = -4

x - 14            = -4 : 7

x - 14            = - 0,6

x                 = -0,6 + 14

x                 = 13,4

a) \(2^4.x-3^2.x=145-\frac{255}{51}\Rightarrow x.\left(2^4-3^2\right)=145-5\)

\(\Rightarrow7.x=140\Rightarrow x=20\)

b) \(\frac{580}{x-24}=329-150.2\Rightarrow\frac{580}{x-24}=329-300\Rightarrow\frac{580}{x-24}=29\Rightarrow x-24=20\)

\(\Rightarrow x=44\)

c) \(7.\left(x-14\right)+35=25+\frac{279}{9}\Rightarrow7.\left(x-14\right)=25+31-35\)

\(\Rightarrow7.\left(x-14\right)=21\Rightarrow x-14=3\Rightarrow x=17\)

a) 580 : ( x - 24 ) = 329 - 150 . 2¹

=> 580 : ( x - 24 ) = 329 - 150 . 2

=> 580 : ( x - 24 ) = 329 - 300

=> 580 : ( x - 24 ) = 29

=> x - 24 = 20

=> x = 20 + 24

=> x = 44

Vậy x = 44

 mk nha các bạn !!!

=> 580 : ( x - 24 ) = 329 - 150 . 2

=> 580 : ( x - 24 ) = 329 - 300

=> 580 : ( x - 24 ) = 29

=> x - 24 = 20

=> x = 20 + 24

=> x = 44

Vậy x = 44

a. => 225-x=135

=> x=225-135

Vậy x=90.

b. => 7.(x-14)+35=25+31

=> 7.(x-14)=25+31-35

=> 7.(x-14)=21

=> x-14=3

=> x=3+14

Vậy x=17

c. => 7^x:7²=7²⁷

=> 7^x-2=7²⁷

=> x-2=27

=> x=27+2

Vậy x=29.

1) ( cái này tính máy tính là ra nha pn )

a)105

b) 100

c)2006

2)

a) => 7x =2390/ 17

=>x=2390/ 119

b) =>7(x-14) = (25+279:9) -35

=> 7(x-14) =21

=> x-14 =3

=> x=17
( click đúng và kết bạn với tớ nha )
 

a)7x+2x=918;           

9x=918

x=102.

Vay x=102.