A = ( 71 + x ) - ( -24 - x ) + ( -35 - x )

= 71 + x - ( -24 ) + x + ( -35 ) + x 

= 71 - ( -24 ) + ( -35 ) + x . 3

= 60 + 3x 

= 3 ( 20 + x ) 

B = x - 34 - [ ( 15 + x ) - ( 23 - x ) ]

= x - 34 - [ 15 + x - 23 + x ]

= x - 34 - ( 15 - 23 ) - 2x

= x - 34 - ( -8 ) - 2x

= x - 26 - 2x 

= ( -x )  - 26 

C ) tương tự 

a. x+60

b. -x-26

c.10

a/ (71+x) - [(-24) - x] + [(-35) - x ]=71+x+24+x-35-x=x+60

b/ x - 34 - [(15 + x) - (23 - x)]=x-34-15-x-23+x=x-72

c/ 26 - [(-x) + 126 - 13) + [(-113) + x]=26+x-126+13-113+x=2x-200=2(x-100)

a) ( 71 + x ) - ( -24 - x ) + ( -35 - x )

= 71 + x + 24 + x - 35 - x

= ( 71 + 24 - 35 ) + ( x + x - x )

= 60 + x

b) x - 34 - [( 15 + x ) - ( 23 - x )]

= x - 34 - ( 15 + x - 23 + x )

= x - 34 - ( 15 - 23 + x2 )

= x - 34 - ( - 8 + 2x )

= x - 34 + 8 - 2x

= x - 2x + 8 - 34

= -x - 26

c) ( -15 + |x| ) + ( -25 - |x| )

= -15 + |x| - 25 + |x|

= -15 - 25 + x + x

= -40 + x2

a)(71+x)-(-24-x)+(-35-x)

=>71+x+24+x-35-x

=>60+x

b)x-34-[(15+x)-(23-x)]

=>x-34-(15+x-23+x)

=>x-34-15-x+23-x

=-x-26

mk chỉ làm ý A thui nha

\(A=\left(71+x\right)-\left(-24-x\right)+\left(-35-x\right)\)

\(A=71+x+24+x+\left(-35\right)-x\)

\(A=\left[71+24+\left(-35\right)\right]+\left(x+x-x\right)\)

\(A=60+x\)

Vậy \(A=60+x\)

\(a,A=\left(71+x\right)-\left(-24-x\right)+\left(-35-x\right)\)

       \(=71+x+24+x-35-x\)

       \(=60+x\)

\(b,B=x-34-\left[\left(15+x\right)-\left(23-x\right)\right]\)

       \(=x-34-\left(15+x-23+x\right)\)

       \(=x-34-15-x+23-x\)

       \(=-x-26\)

a,(71+x)-(-24-x)+(-35-x)

=71+x+24+x-35-x

=(71+24-35)+x+(x-x)

=60+x

b,x-34-[(15+x)-(23-x)

=x-34-(15+x-23+x)

=x-34-15-x+23-x

=(x-x)+(-34-15+23)-x

=0+(-26)-x

=(-26)-x

c,(-15+|x|)+(25-|x|)

=-15+|x|+25-|x|

=(-15+25)+(|x|-|x|)

=10+0

=10

a.    M=71+x+21+x-35-x

       M=57+x

b.   N=x-34-(15+x-23+x)

N=x-34-38-2x

N=-72-x

the con phan c lam the nao

a: x+31+40=x+71

b: =-35-x-23-61=-119-x

a) \(M=\left(71+x\right)-\left(-24-x\right)+\left(-35-x\right)\)

\(=71+x-\left(-24\right)+x+\left(-35\right)-x\)

\(=60+x\)

b) \(x-34-\left[\left(15+x\right)-\left(23-x\right)\right]\)

\(=x-34-\left(15+x-23+x\right)\)

\(=x-34-\left(-8+2x\right)\)

\(=x-34-\left(-8\right)-2x\)

\(=-26-x\)

c) \(\left(-15+\left|x\right|\right)+\left(25-\left|x\right|\right)\)

\(=-15+\left|x\right|+25-\left|x\right|\)

\(=10\)