Question

Cho bieu thuc : A = ( -a - b + c ) - ( -a - b -c )

a ) Rut gon A

Answer 1

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

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

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

= 0 + 0 + 2c

= 2c

Answer 2

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

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

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

A= 0 + 0 + 2c

A= 2c

Vay A= 2c

tik nha

Answer 3

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

   = -a-b+c+a+b+c

   = (-a+a)-(b-b)+(c+c)

   = 0-0+c.2

   = c.2

Answer 4

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

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

A= 0+0+2c

A= 2c