Question

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

b) -(a-b-c) + (a-b-c) Mik cần gấp mik sẽ tick cho bạn trả lời

Answer 1

\(\left(a-b+c\right)-\left(a-b+c\right)=0\)

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

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

=0