11 - (x+48) = 97

=> x + 48 = 97 - 11

=> x + 48 = 86

=> x = 86 - 48

=> x = 38

vậy____

-(x+48) + 213 = -16

=> -x - 48 = -16 - 213

=> -x - 48 = -229

=> -x = -229 + 28

=> -x = -201

=> x = 201

vậy____

1, 11-(x+48)=97

\(\Rightarrow x+48=11-97\)

\(\Rightarrow x+48=-86\)

\(\Rightarrow x+48=-134\)

Vậy x=134

2,-(x+48)+213=-16

\(\Rightarrow-\left(x+48\right)=-16-213\)

\(\Rightarrow-\left(x+48\right)=-229\)

\(\Rightarrow x+48=229\)

\(\Rightarrow x=229-48\)

\(\Rightarrow x=181\)

Vậy x=181

11 - (x+48) = 97

x + 48 = 11 - 97 

x + 48 = - 86

x = - 86 - 48

x = - 134

-(x+48) + 213 = -16

- ( x + 48 ) = - 16 - 213

- ( x + 48 ) = - 229

- x - 48 = - 229

- x = - 229 + 48

- x = - 181

=> x = 181

a) -x - 84=-16-213

   -x-84=-229

    -84+229=x

        145 =x

b) /x+2/= 316

suy ra x+2=316 hoac x+2=-316

  * x+2 = 316

       x = 314

* x+2 =-316

    x   = -318

vay x=314 hoac x=-318

c) /x+7/=15

suy ra x+7=15 hoac x+7=-15

   x+7=15

     x  = 8

   x+7= -15

     x = -22

vay x= 8 hoac x=-22

d) 19-4=/x-1/

   15=/x-1/

suy ra x-1=15 hoac x-1=-15

x-1=15

   x = 16

x-1=-15

  x= -14

vay x=16 hoac x=-14

\(-\left(x+84\right)+213=-16\)

\(=>-x-84+213=-16\)

\(=>-x=-16+84-213=-145\)

\(=>x=145\)

\(\left|x+2\right|=341+\left(-25\right)\)

\(=>\left|x+2\right|=341-25=316\)

\(=>\orbr{\begin{cases}x+2=316\\x+2=-316\end{cases}}\)

\(=>\orbr{\begin{cases}x=314\\x=-318\end{cases}}\)

\(\left|x+7\right|=\left|-15\right|\)

\(=>\left|x+7\right|=15\)

\(=>\orbr{\begin{cases}x=15-7\\x=-15-7\end{cases}}\)

\(=>\orbr{\begin{cases}x=8\\x=-22\end{cases}}\)

\(19-\left|x-1\right|=4\)

\(=>\left|x-1\right|=19-4=15\)

\(=>\orbr{\begin{cases}x-1=15\\x-1=-15\end{cases}}\)

\(=>\orbr{\begin{cases}x=16\\x=-14\end{cases}}\)

a)   461+x-45=387

<=> 416+x=387

<=> x= -28

b)   11+53-x=97

<=> 64-x=97

<=>x=-33

c)   -x-84+213=-16

<=>-x+129=-16

<=> x=145

461 + (x - 45) = 387

           x - 45   = 387 - 461

           x - 45   = -74

           x          = -74 + 45

           x          = -29

11 - (-53 + x) = 97

        -53 + x  = 11 - 97

        -53 + x  = -86

                 x  = -86 - -53

                 x  = -33

- (x+84) + 213 = -16

   x - 84 + 213 = -16

   x - 84           = -16 - 213

   x - 84          = -229

   x                 = -229 + 84

   x                 = -145

461 + ( x - 45 ) = 387

            x - 45  = 387 - 461

             x - 45 = - 74

                    x = - 74 + 45

                    x = - 29

Vậy x = - 29

11 - ( - 53 + x ) = 97

        - 53 + x   = 11 - 97

        - 53 + x   = - 86

                  x   = - 86 - ( - 53 ) 

                  x   = - 33

Vậy x = - 33

\(A=\dfrac{1}{5}\left(\dfrac{1}{6}-\dfrac{1}{11}+\dfrac{1}{11}-\dfrac{1}{16}+...+\dfrac{1}{496}-\dfrac{1}{501}\right)\)

\(=\dfrac{1}{5}\cdot\dfrac{55}{334}=\dfrac{11}{334}\)

\(B=1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+...+\dfrac{1}{19}-\dfrac{1}{21}=\dfrac{20}{21}\)

a)11-(-53+x)=97

11+53+x=97

64+x+97

x=97-64

x=33

b)-(x+84)+213=-16

-(x+84)=-16-213

-(x+84)=-229

-x=-229-84

-x=-313

x=313

11- (x+84) = 97 

=> 11 -x - 84 = 97 

=> 11-x = 181

=> x= 11- 181 

=> x= -170

cấc câu sau làm tương tự

11 - (x + 84) = 97

x + 84 = 11 - 97

x + 84 = -86

x = -86 - 84

x = -170

-(x + 84) + 213 = -16

-x - 84 = -16 - 213

-x - 84 = -229

-x = -229 + 84

-x = -145

x = 145

x + (-35) = 18

x - 35 = 18

x = 18 + 35

x = 53

-2x -(-17)= 15

-2x + 17 = 15

-2x = 15 - 17

-2x = -2

x = -2 : (-2)

x =1

a,11-(x+84)=97

11-x-84   =97

11-x         =97+84

11-x         =181

x              =11-181

x              =-170

b,-(x+84)+213=-16

-x-84+213   =-16

-x-84           =-16-213

-x-84           =-229

-x                 =-229+84

-x                 =-145

x                  =145

c,x+(-35)=18

x-35    =18

x         =18+35

x         =53

d,-2x-(-17)=15

-2x+17      =15

-2x            =15-17

-2x            =-2

-x              =-2:2

-x              =-1

x               =1

\(\left(19x+2.5^1\right):14=\left(13-8\right)^2-4^2.\)

\(\left(19x+10\right):14=5^2-4^2\)

\(\left(19x:4\right)+\left(10:4\right)=25-16\)

\(\left(19x:4\right)+\frac{5}{2}=9\)

\(19x:4=9-\frac{5}{2}\)

\(19x:4=\frac{13}{2}\)

\(19x=\frac{13}{2}.4=26\)

\(x=\frac{26}{19}\)

B/ \(-\left(x+84\right)+213=\left(-16\right).\)

\(-x-84+213=-16\)

\(-x+129=-16\)

\(-x=\left(-145\right)\)

\(\Rightarrow x=145\)