I don't know

a)-a-b+a+c

b)-a+c-a+b-c

c)b-b-a+c

d)-a+b-c-a-b-c

e)a+b-a+b+a-c-a-c

g)a+b-c+a-b+c-b-c+a-a+b+c

a) -a -( b - a - c ) = -a - b + a + c = - b + c

b) - ( a - c ) -( a - b + c ) = -a + c - a + b - c = - 2a + b

c) b - ( b + a - c ) = b - b - a + c = - a + c

d) - ( a - b + c ) - ( a + b+ c)= - a + b - c - a - b - c = - 2a - 2c

e) ( a + b ) - ( a -b ) + ( a -c ) - ( a + c ) = a + b - a + b + a - c -a - c = 2b - 2c

g) ( a + b - c ) + ( a - b + c ) - ( b + c - a ) - ( a - b -c )

= a + b - c + a - b + c - b - c+ a-a + b + c

= 2a

1) Đơn giản biểu thức SAU khi bỏ dấu ngoặc:

a) - a - (b - a - c) = -a - b + a + c = -b + c

b) - (a - c) - (a - b - c) = - a + c - a + b + c = - 2a + 2c + b

c) b - (b + a - c) = b - b - a + c = - a + c

d) - (a - b - c) - (a + b + c) = -a + b + c - a - b - c = -2a 

a) \(-a-\left(b-a-c\right)=-a+b+a+c=b+c\)

b) \(-\left(a-c\right)-\left(a-b-c\right)=-a+c-a+b+c=-2a+2c+b\)

c) \(b-\left(b+a-c\right)=b-b-a+c=-a+c\)

d) \(-\left(a-b-c\right)-\left(a+b+c\right)=-a+b+c-a-b-c=-2a\)

a) \(-a-b+a+c=c-b\)

b) \(-a+c-a+b-c=b-2a\)

c)\(b-b-a+c=c-a\)

d)   \(-a+b-c-a-b-c=-2a-2c\)

a)(a + b - c) - (b - c + d)

=a + b - c - b + c - d

=a + (b - b) -(c + c) - d

=a + 0 - c² - d

b)- (a - b + c) + (a - b + d)

=-a + b - c + a - b + d

=(-a + a) + (b - b) - c + d

=0 + 0 - c + d

c) -(a + b) - (-a - b + c)

=-a - b + a + b - c

=(-a + a) - (b + b) - c

=0 - b² - c

d)(a - b) - (c - d) - (a - c)

=a - b - c + d - a + c

=(a - a) - b - (c + c) + d

=0 - b - c² + dd

Mỏi cả tay😧

c,f  fk,l,xskooe

a)-a - (b - a - c) = -a - b + a + c = (-a + a) + (c - b) = c - b

b) -(a - c) - (a - b + c) = -a + c - a + b - c = (-a - a) + (c - c) + b = b - 2a

c) -(a - b + c) - (a + b + c) = -a + b - c - a - b - c = (-a - a) + (b - b) - (c + c) = -2a - 2c

Bài làm

a) -a - ( b - a - c )

= -a - b + a + c

= b - c

b) -( a - c ) - ( a - b + c )

= -a + c - a + b - c

= -2a + b

= b - 2a

c) -( a - b + c ) - ( a + b + c )

= -a + b - c - a - b - c

= -2a - 2c

= -2( a + c )

a, \(a,-a-\left(b-a-c\right)=-a-b+a+c=-b+c\)

b, \(-\left(a-c\right)-\left(a-b+c\right)=-a+c-a+b-c=-2a+b\)

c, \(-\left(a-b+c\right)-\left(a+b+c\right)=-a+b-c-a-b-c=-2a-2c\)

a)  -a+c-a+b-c=-2a+b
b)  b-b-a+c    =-a+c
c)  -a+b-c-a-b-c=-2a

1/   Đơn giản biểu thức sau khi bỏ dấu ngoặc:

    a/ (a+b-c)-(b-c+d) 

a+b+c-b+c-d

     b/ -(a-b+c)+(a-b+d)

-a+b-c+a-b+d

      c/ (a+b)-(-a+b-c)

a+b+a-b+c

     d/ -(a+b)+(a+b+c)

-a-b+a+b+c

      e/ (a-b+c)-(a-b+c)

a+b+c-a+b-c

      f/ -(a-b-c)+(a-b-c)

-a+b+b+a-b-c

    a/ (a+b-c)-(b-c+d) = a+b-c-b+c-d =a+d

     b/ -(a-b+c)+(a-b+d)=-a+b-c+a-b+d=c+d

      c/ (a+b)-(-a+b-c)=a+b+a-b+c=2a+c

     d/ -(a+b)+(a+b+c)=-a-b+a+b+c=c

      e/ (a-b+c)-(a-b+c)=a-b+c-a+b-c=0

      f/ -(a-b-c)+(a-b-c)=-a+b+c+a-b-c=0

a/  a-d

b/d-c

c/2a+c

a) -a - (b - a - c)

  = -a - b + a - c

  = c - b

b) - (a - c) - (a -b +c)

 = - a + c - a + b - c 

 = -2a + b

a, \(-a-\left(b-a-c\right)=-a-b+a+c=-b+c\)

b, \(-\left(a-c\right)-\left(a-b+c\right)=-a+c-a+b-c=-2a+b\)

a,-a-(b-a-c)

=-a-b+a+c

=(-a+a)-b+c

=0-b+c

=-b-c

a,-a-(b-a-c)

=-a-b+a+c

=-a+a-b+c

=0-b+c

=-b+c

b,-(a-c)-(a+b+c)

=-(a-c)-a-b-c

=-a-c-a-b-c

c,b-(a+b-c)

=b-a-b+c

=b-b-a+c

=0-a+c

=-a+c

Mỏi quá mai làm nốt!