Question

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

Answer 1

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

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

= -b - a + c + c + c

= -b - a + 3c

Answer 2

Đề là rút gọn phải không?

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

= - a - b + 3c

Answer 3

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

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

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

\(=\left(-a\right)+\left(-b\right)+3c\)

Answer 4

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

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

= -a-b+3c