\(10+2x=16\)

\(2x=16-10\)

\(2x=6\)

\(x=3\)

vay \(x=3\)

\(720:\left[41-\left(2x-5\right)\right]=40\)

\(720:\left(41-2x+5\right)=40\)

\(46-2x=720:40\)

\(46-2x=18\)

\(2x=46-18\)

\(2x=28\)

\(x=14\)

vay \(x=14\)

a) <=> 2x=6

<=>x=3

b)41-(2x-5)=18

<=>2x-5=23

2x=28

x=14

mk ko ghi đề nha chúc bn học tốt 

10+2.x=16                               hãy kích cho những người chi thức

     2.x=16-10

     2.x=6

      x=6:2

      x=3                               

[ 2. ( 70 - x ) + 72 ]: 2 =46

2. ( 70 - x ) + 72 = 46.2

2. ( 70 - x ) + 72 = 92

2. ( 70 - x ) =92-72

2. ( 70 - x ) =20

70-x=20:2

70-x=10

x=70-10

x=60

[ ( 2.x + 54 ) - 32 ] . 2 = 244 

 ( 2.x + 54 ) - 32 = 244:2

( 2.x + 54 ) - 32 = 122

2.x + 54 = 122+32

2.x + 54 = 154

2.x =154-54

2x=100

x=100:2

x=50

ko sao ,ta van la bn ma,hjhj

cho mk hỏi là trc đây mk vs bn k wen đúng k?

don't worry

\(\left[\left(x^2+54\right)-32\right].2=244\)

\(\Rightarrow\left(x^2+54\right)-32=122\)

\(\Rightarrow x^2+54=154\)

\(\Rightarrow x^2=100\)

\(\Rightarrow x=\pm10\)

Vậy \(x=\pm10\)

2 bọn ngu dễ thế này ko cx ko xong

[2.(70-x)+72]:2=46

<=>2.(70-x)+72=92

<=>2(70-x)=20

<=>70-x=10

<=>x=60

[2.(70-x)+72]:2=46

=>2.(70-x)+72=46.2

=>(70-x)+72=46

=>70-x=46-72

=>70-x=-26

=>x=70-(-26)

=>x=70+26

=>x=96

\(\left[2\times\left(70-x\right)+72\right]\div2=46\)

\(\Rightarrow\left[2\times\left(70-x\right)+72\right]=46\times2\)

\(\Rightarrow\left[2\times\left(70-x\right)+72\right]=92\)

\(\Rightarrow2\times\left(70-x\right)=92-72\)

\(\Rightarrow2\times\left(70-x\right)=20\)

\(\Rightarrow\left(70-x\right)=20\div2\)

\(\Rightarrow\left(70-x\right)=10\)

\(\Rightarrow x=70-10\)

\(\Rightarrow x=60\)

\(\frac{1}{x+1}+\frac{1}{x-1}+\frac{2}{1-x^2}\)

\(=\frac{1}{x+1}+\frac{1}{x-1}-\frac{2}{\left(x-1\right)\left(x+1\right)}\)

\(=\frac{x-1+x+1-2}{\left(x-1\right)\left(x+1\right)}\)

\(=\frac{2x-2}{\left(x-1\right)\left(x+1\right)}\)

\(=\frac{2\left(x-1\right)}{\left(x-1\right)\left(x+1\right)}\)

\(=\frac{2}{x+1}\)